Next release 0.19.16

Account
* get_withdraw_routes added
* get_account_votes fixed for appbase
* get_vote, has_voted added
* virtual_op_count, get_curation_reward curation_stats added
* get_account_history and history_reverse added
* history improved
Blockchain
* hash_op added
CLI
* default vote weight added
* upvote added
* Info improved
Steem
* get_block_interval added
Transactionbuilder
* txbuffer.clear() added on exception
Vote
* AccountVotes fixed
GrapheneRPC
* Websocket disconnect exception handling improved
Compare_With_steem_python_account.py added
Unittests for account improved