Merge bitcointools upstream changes and update callers.
New command Abe.admin.
Null out prev_block_id to avoid constraint error deleting block.
delete-chain-blocks: null out search_block_id.
delete-tx: new command.
link-txin: new command.
* delete-chain-transactions: new command.
* rewind-datadir: new command.
Update DataStore.py
Update copyright and contact info for team ownership.