Support Bitcoin Cash

Fix panic in orphan transaction pool

Afri authored Aug 17, 2017 and Marek Kotewicz committed Aug 17, 2017

* Remove redundant timestamp.

* Measure block processing in the logs

* Use tabs to separate status.

* Show updates every 1000 blocks.

* Reword some warnings.

* Add some color to log level.

* Reduce code redundancy

* No need to specify the type for blocks_speed

* Utilize the return value of match.

* Count all peers.

* Add whitespaces

* Remove another redundant timestamp

* One item per line

* Use tabs not spaces

* Remove unused import

* Remove redundant time imports

* Paint it black.

Synchronization fixes

Add a snapcraft build badge

Add the command to install the parity-bitcoin snap

Added `--verification-level` && `--verification-edge` cli options