Ensure total tokens in system is kept up to date (#428)

* Squashed commit of the following:

commit 802b219d86a63f2a68a2f2fbc406229d192ce99f
Author: shamardy <[email protected]>
Date:   Tue Aug 14 19:13:52 2018 +0200

    Removed set_bad_validators function

commit 53d17fc4c7798a5cf180bc8783213e0b50068ecc
Merge: 671c53a6 354457d9
Author: shamardy <[email protected]>
Date:   Tue Aug 14 18:00:56 2018 +0200

    Merge branch 'master' into Issue#303

commit 671c53a68f0357171d1bbbcd46f1ed7dd68755af
Author: shamardy <[email protected]>
Date:   Tue Aug 14 08:16:55 2018 +0200

    Updated test

commit 6c7d8f455841cfe1902e700d230844b393a2aa16
Author: shamardy <[email protected]>
Date:   Tue Aug 14 08:14:07 2018 +0200

    Squashed commit of the following:

    commit f5a74b4804bc1a244d35f679c2a60cffe556ca3c
    Author: shamardy <[email protected]>
    Date:   Tue Aug 14 07:30:36 2018 +0200

        Update Tests

    commit 39724da56d1782e9d5303ea8764dfdf8d7f517ec
    Author: shamardy <[email protected]>
    Date:   Tue Aug 14 06:45:34 2018 +0200

        fix

    commit 9d564c707fe5d0e4de005ab55c63c136722e6591
    Author: shamardy <[email protected]>
    Date:   Tue Aug 14 06:36:50 2018 +0200

        fix

    commit 0c2bad1da22488ea8cae2a6119a374bf9b628596
    Author: shamardy <[email protected]>
    Date:   Tue Aug 14 05:53:35 2018 +0200

        fix

    commit f7069b3784579a2d20b6298d021b0d99d3f9beb6
    Author: shamardy <[email protected]>
    Date:   Tue Aug 14 00:34:10 2018 +0200

        Function to set bad validators

    commit 7c9bb146ba7adacde29a11e16b0194a29d0d77c8
    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 23:35:46 2018 +0200

        fix

    commit 641eb4267031478d60e4e1476231629052d10549
    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 23:00:08 2018 +0200

        Edit

    commit 5981f5fd5ee65dac9c3e19275ae4647cb173d798
    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 22:25:56 2018 +0200

        Edit fix

    commit db3dd37c435ddc5dad0f9dde56cf7be539a0e1d0
    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 21:39:57 2018 +0200

        fix

    commit bdb34c4f14fd68b3d307980da1182075bc74f156
    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 21:11:08 2018 +0200

        Edit for early exit slashing tests by adding bad validators manually

    commit 8134bc6d
    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 15:06:57 2018 +0200

        Update header root to match storage root in wasm test

    commit ee893f65
    Author: shamardy <[email protected]>
    Date:   Sun Aug 12 15:27:57 2018 +0200

        Update header root to match storage root in test

    commit eb1fb61b
    Author: shamardy <[email protected]>
    Date:   Sun Aug 12 14:07:40 2018 +0200

        Update tests

    commit f27559b3
    Author: shamardy <[email protected]>
    Date:   Sun Aug 12 13:14:13 2018 +0200

        Squashed commit of the following:

        commit ac244e219f6e4c5f1b19463f33ce2edb3b66f6c3
        Author: shamardy <[email protected]>
        Date:   Sun Aug 12 12:55:25 2018 +0200

            Edited Tests

        commit 93ac939024da55bb90479b3fcbaf82fc4407727f
        Author: shamardy <[email protected]>
        Date:   Sun Aug 12 12:08:47 2018 +0200

            Squashed commit of the following:

            commit 910ff83a3b0405546f0a7a1d8727e69ec22f2513
            Author: shamardy <[email protected]>
            Date:   Sun Aug 12 03:53:40 2018 +0200

                Edited Test

            commit 2758bc44007652fd05bab221df3f349fe7daeb6a
            Author: shamardy <[email protected]>
            Date:   Sun Aug 12 03:16:38 2018 +0200

                Check that block 4 is the final block in session

            commit 49f4043e0fb44118c833b3063f4820213d279bac
            Author: shamardy <[email protected]>
            Date:   Sun Aug 12 02:31:12 2018 +0200

                LastLengthChange should change to block number when setting length

            commit eb5873550810a25ca093a635405bb069a0610d10
            Author: shamardy <[email protected]>
            Date:   Sun Aug 12 00:17:22 2018 +0200

                Squashed commit of the following:

                commit 48fae25a49b0aa3294ab04651f0c2cb530994d9a
                Author: shamardy <[email protected]>
                Date:   Sat Aug 11 23:32:25 2018 +0200

                    Increase TotalStake by ReclaimRebate if NewAccountOutcome::GoodHint

                commit d1166230ad3dcda00cc6916efe5d0d18007ecc4f
                Author: shamardy <[email protected]>
                Date:   Fri Aug 10 01:45:48 2018 +0200

                    Updating set_free_balance_creating

                commit fbdabd802a618af5311d21c5ec7e4b25d50cd705
                Author: shamardy <[email protected]>
                Date:   Fri Aug 10 00:52:40 2018 +0200

                    fix for TotalStake tracking in transfer and set_free_balance_creating fn

                commit f26bb1d6faeab3bb9a997ea0498009bc25dae244
                Author: shamardy <[email protected]>
                Date:   Fri Aug 10 00:03:17 2018 +0200

                    Fix if account created on an old account with more balance

                commit f0952094de2b3ab8528fb42794d98504c647cc7a
                Author: shamardy <[email protected]>
                Date:   Thu Aug 9 22:32:48 2018 +0200

                    fix

                commit 28260e570c3b81b79cb390d097a7a941f44dfc0a
                Author: shamardy <[email protected]>
                Date:   Thu Aug 9 21:36:27 2018 +0200

                    fix totalstake update in set_free_balance_creating fn if account exists

                commit b72fd6fab556eb0ad653d805ee4c415cbf88561d
                Author: shamardy <[email protected]>
                Date:   Thu Aug 9 20:26:30 2018 +0200

                    TotalStake is updated in contract_transfer_max_depth function

                commit 2fa1cc27dc75229b941eba686a33fa6906f7b1a8
                Author: shamardy <[email protected]>
                Date:   Thu Aug 9 20:22:17 2018 +0200

                    Squashed commit of the following:

                    commit 7fbf74c5e55038b006d6ac57621ed42c00fdd0e4
                    Author: shamardy <[email protected]>
                    Date:   Thu Aug 9 19:08:49 2018 +0200

                        fix for tests with set_free_balance calls

                    commit c6b4196f853191467d8a99c9604ba692425bbbaa
                    Author: shamardy <[email protected]>
                    Date:   Thu Aug 9 18:28:03 2018 +0200

                        Update TotalStake where set_free_balance is called

                    commit e827abc5184d48728168fbb57be6e8f03a8504e9
                    Author: shamardy <[email protected]>
                    Date:   Thu Aug 9 16:57:36 2018 +0200

                        Update TotalStake where set_reserved_balance is called

                    commit f73bec9c1a8376360b992e39333d762892ca8735
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 16:44:59 2018 +0200

                        fix

                    commit 5a498c5f4660429f7a24c09e715f7b083266c93d
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 15:47:03 2018 +0200

                        Test for full_native_block_import_works to check storage root

                    commit 024249ca52ae7ef0f5d39e99c585617a3db1dc0c
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 14:38:07 2018 +0200

                        Use <FreeBalance<Test>>::insert in this fn to avoid TotalStake Overflow

                    commit d602839cd59dd8550c87ec2c0bf103c806daedab
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 13:59:47 2018 +0200

                        Removed <TotalStake<Test>>::put from tests

                    commit 38586043912b40c9004bb5232cb7ca3c01ec9144
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 13:56:15 2018 +0200

                        Replace Balance::insert in tests to set balance fn to update TotalStake

                    commit 170ab6f8cd152adbc525bcc32fa012e3c11b6177
                    Merge: 9b0b22bd 2230b61c
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 12:32:05 2018 +0200

                        Merge branch 'Issue#303' of https://github.com/shamardy/polkadot into Issue#303

                    commit 9b0b22bd2084083f610e4870d5866bbd8e8d7229
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 12:31:45 2018 +0200

                        Edit

                    commit 2230b61c261296f6d09d0ec5353c0f207b281a67
                    Merge: 2fe9c528 18d4234b
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 11:12:19 2018 +0200

                        Merge branch 'master' into Issue#303

                    commit 2fe9c528bef62b0f43ef98c5166408d7d048f513
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 11:09:08 2018 +0200

                        commented out some tests

                    commit a6c2d8412e1d8e409d4fe2ca6545be5e525d80b0
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 10:35:17 2018 +0200

                        fix

                    commit ceb34d873b48ea7debd878a78f57ce235acd6ee8
                    Author: shamardy <[email protected]>
                    Date:   Thu Aug 2 16:52:16 2018 +0200

                        Update

                    commit a363120bd1b72597deb6ee945f9c51d32a851b14
                    Author: shamardy <[email protected]>
                    Date:   Thu Aug 2 16:05:40 2018 +0200

                        Edit

                    commit e45a92847a4beb28aa6f876ec109585467f4d732
                    Author: shamardy <[email protected]>
                    Date:   Wed Aug 1 16:49:40 2018 +0200

                        Edit

                    commit 07c5dcec22e43d6ccb49b42356590fb370bbcfae
                    Author: shamardy <[email protected]>
                    Date:   Tue Jul 31 15:44:40 2018 +0200

                        Instead of update_total_stake => 2 functions to increase and decrease

                    commit 7eb03b29e429a86d206244779d383af9437f208d
                    Author: shamardy <[email protected]>
                    Date:   Tue Jul 31 14:24:36 2018 +0200

                        Removed update_total_stake from set_free_balance_creating

                    commit 234ff798c6a7e035c7d3f7a9a668e311f9940dc5
                    Author: shamardy <[email protected]>
                    Date:   Tue Jul 31 14:22:48 2018 +0200

                        Squashed commit of the following:

                        commit 8f2e421a731f353394c611dc6e93ad48ba811a1a
                        Author: shamardy <[email protected]>
                        Date:   Tue Jul 31 13:24:30 2018 +0200

                            added balances to trait Store

                        commit b64c3a99467895b042f6a30219caf87f8265fa90
                        Author: shamardy <[email protected]>
                        Date:   Tue Jul 31 12:52:16 2018 +0200

                            update_total_stake iterates through balances

                        commit bf503ecc6b3664a6be7eac6adef3f83f72e4a8fa
                        Author: shamardy <[email protected]>
                        Date:   Tue Jul 31 11:06:25 2018 +0200

                            Removed update_total_stake from inside transfer function for now to test

                        commit d91a8a666b5b52e1c77b72e3ae59040e71cd8d9c
                        Author: shamardy <[email protected]>
                        Date:   Mon Jul 30 21:26:09 2018 +0200

                            update_total_stake function fix

                        commit 2465361fe9f631ae790d3f24ef69f9972b6adae5
                        Author: shamardy <[email protected]>
                        Date:   Mon Jul 30 21:10:02 2018 +0200

                            fix

                        commit 2351f3532d6ba28491231bcb0717f8e76fc35629
                        Author: shamardy <[email protected]>
                        Date:   Mon Jul 30 19:36:21 2018 +0200

                            fix

                        commit 7139371e5c07cc41112468e82d7ec901e8361d60
                        Author: shamardy <[email protected]>
                        Date:   Mon Jul 30 18:38:50 2018 +0200

                            update

                        commit e6602d1f98190f35565d3c31e3b7a2d3df64607e
                        Author: shamardy <[email protected]>
                        Date:   Mon Jul 30 18:36:43 2018 +0200

                            Squashed commit of the following:

                            commit dcb597a60c960ff40623e98c6a1210f5df196794
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 18:31:49 2018 +0200

                                update

                            commit c41382eb135eda3bffa957e8887fcffd0388a745
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 18:23:59 2018 +0200

                                Update

                            commit f828c69e055489b69739b0ea082afa1ceca23b9c
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 18:12:18 2018 +0200

                                Created function to update total stake

                            commit e398a587edb7e57378bd61c9f9940aadfb94e82a
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 15:02:07 2018 +0200

                                TotalStake tracks transfer fees + added test for account removal

                            commit 0cfb26ce508578ce386bac5e02856cb6f298c6ba
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 14:21:06 2018 +0200

                                TotalStake tracks accounts removal when free/reserved balance is too low

                            commit 6054dcf171eddfbe58c4e01f2b32b6f576e3d9c7
                            Merge: 5740c8fc 6fa9c949
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 14:16:37 2018 +0200

                                Merge branch 'Issue#303' of https://github.com/shamardy/polkadot into Issue#303

                            commit 5740c8fc09cdac9ec2228a66626b1c1ecb5dbeaf
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 14:15:41 2018 +0200

                                Resolved merge conflict by incorporating both suggestions.

                            commit 6fa9c949b9257bccb7ee48c32af35182a4dbf5f8
                            Merge: 2b29fe85 9d7a3c1d
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 14:12:11 2018 +0200

                                Merge branch 'master' into Issue#303

                            commit 2b29fe85ff0802594ad203d430ec4653f980296d
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 13:48:48 2018 +0200

                                Squashed commit of the following:

                                commit 773cdb913f671f575cc2933b14f2e783f49ffd7e
                                Author: shamardy <[email protected]>
                                Date:   Mon Jul 30 13:13:21 2018 +0200

                                    Squashed commit of the following:

                                    commit 07dc1945c3b51438028494f7691343638d647a93
                                    Author: shamardy <[email protected]>
                                    Date:   Mon Jul 30 13:08:00 2018 +0200

                                        TotalStake tracks accounts removal when free/reserved balance is too low

                                    commit 1b04d3afab44c99751c389ac6cddd865c0f77015
                                    Author: shamardy <[email protected]>
                                    Date:   Thu Jul 26 21:29:35 2018 +0200

                                        Edited slashing reserved balance tests

                                    commit 52482d5ac5828e927afcd7f27010ef64c085353f
                                    Author: shamardy <[email protected]>
                                    Date:   Thu Jul 26 20:46:17 2018 +0200

                                        Edited some tests

                                    commit 7c98f96d2ea1952b241054581bc1430863e4aab4
                                    Author: shamardy <[email protected]>
                                    Date:   Thu Jul 26 20:11:54 2018 +0200

                                        TotalStake tracks slashing of reserved balance

                                    commit 1d9f942ede81281218c1b4f84201388cf0908a4e
                                    Author: shamardy <[email protected]>
                                    Date:   Thu Jul 26 18:43:36 2018 +0200

                                        Ensure total tokens in system is kept up to date

* Fix Test