Changelog:
============
* Fix: Message Type 24 Part B: Detecting MMSI as auxiliary
* add support for AIS Message Type 24 Part B auxiliary craft variant
* auxiliary craft now decode mothership MMSI instead of vessel dimensions
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
