handle electrum server disconnects and switch to new servers automatically, refactor server lists to data file
add SSL connections to electrum
Bugfixes in electrum code:
Restart on connectionFailed as well as connectionLost
Query utxo set must return (only) None for nonexistent/spent utxos.
Dont include twisted logging for wallet-tool
start thread immediately for early blockchain queries
timeout non-responsive servers
fix abstractBCI refs in subclasses