Added encryptwallet call to bitrpc.py
This was the only call requiring password input which was still missing. Much useful to avoid leaving a plain text passphrase in the shell log.
Allows for sending of all standard Bitcoin commands via RPC rather than as command line args.
BitRPC.py is able to do the exact same thing as
walletunlock.py. Their respective commands in BitRPC.py are:
bitrpc.py walletpassphrasechange bitrpc.py walletpassphrase