* Log block number and earliest available block when snapshots fail to start
* Increase default pruning history to 128
Increase default pruning memory to 48Mb
* Decrease SNAPSHOT_PERIOD to 200 to get them snapshots started quicker
* Sync updates to defaults with the args parser
* Fix tests
* Restore the SNAPSHOT_PERIOD to 5000
* One more
* Update ethcore/src/client/config.rs