Add a test.

* abort snapshot restoration faster

* flag-checking tests

[ci:skip]

previously it kept all seen code in memory, leading to
high memory usage by the end of state restoration

* stub implementations of light client trait

* Light provider trait

* light client sync stubs

* LES boilerplate

* stub implementation of provider for client

* skeleton and request traits

* request definitions

* new_list -> begin_list

* handle unknown packet

* revise light implementation strategy

* make verification module public

* Move all light client work to own crate

* experiment with answering requests

* buffer flow scaffolding

* remove LESv2 requests

* buffer flow basics, implement cost table

* begin status module

* implement handshake parsing and creation

* implement announcement serialization

* errors, punishment, and handshake

* handle announcements

* making announcements, clean up warnings

* allow dead code temporarily

* Signer RAW confirmations

* Returning address book as eth_accounts

* UI support for in-browser signing

* Post review fixes

* Adding new methods to jsonrpc

* Fixing eth_accounts

* Deterministic accounts ordering

Gav Wood authored Nov 09, 2016 and Arkadiy Paronyan committed Nov 09, 2016

* Add new transaction tests.

* Add new test.

* `--mode=off` now works.

* Add Mode::Off as a persistent CLI option.

* "last" not "auto" as default.

* Commit accidentally unsaved file.

* Whitespace

[ci:skip]

* Mode CLI parse fix

* or offline

* Save mode when it gets changed.

* Fix Offline mode

* Fix up mode operations.

* Make passive default, but not overriding.

* Fix test

* Maybe not everyone wants to run an archive node...