Fix unit test

new_vote renamed to not_broadcasted_vote

Fix unit tests and adapt mvest/vest relation for vests_to_rshares

Prepare next version and fix account refresh and ops_statistics

Fix unit test

Add docu for conveyor and readme updated

Fix flake8 and improve steemconnect fix for holgern#57

Several improvements and fixes

CLI
* upvote and downvote fixed
Snapshot
* refactoring
* update_vote and build_vp_arrays added for showing vote power history
Examples
* account_vp_over_time added

Add blocknumber check to wait_for_and_get_block

Merge pull request holgern#41 from netuoso/master

Add vit to known_formats