* New incognito format with checksum for password verification.  Old format
  continues to be supported with '--old-incog-fmt' option

* mmgen-txsign: '--mmgen-keys-from-file' option (supersedes
  '--all-keys-from-file' option) allows offline signing of transactions with
  both MMGen and non-MMGen inputs.  Instead of a flat keylist, a key-address
  file (the output of 'mmgen-keygen'), optionally encrypted, is used both as a
  key source and to verify MMGen-to-BTC mappings for both inputs and outputs,
  eliminating the need for an additional address file.

* mmgen-addrimport: '--keyaddr-file' option allows using key-address file
  (possibly encrypted) as an address source.