Version 0.7.4

  Additions/improvements:

  mmgen-txsign     - sign multiple transactions in one operation

  mmgen-addrimport - skip rescanning block chain for new addresses

  mmgen-tool - new functions:

    Bitcoind operations:
    listaccounts - like 'bitcoind listaccounts' but shows MMGen wallet balances
                   too
    getbalance   - like 'bitcoind getbalance' but shows confirmed/unconfirmed,
                   spendable/unspendable

    MMGen-specific operations:
    id8          - generate 8-character MMGen ID checksum for file (or stdin)
    id6          - generate 6-character MMGen ID checksum for file (or stdin)