Major new features:
- No RAM buffer for the NMEA message being parsed; saves 120 bytes of RAM.
- More robust parser, a little less likely to be confused by bad messages.
- Added configuration strings for SiRF, ublox and MediaTek GPS in NMEA mode to select just the messages of interest.
Note that the issue that TinyGPS has with co-ordinates with "different" numbers of decimal digits is addressed in this code.
Size is comparable to the old parser.
git-svn-id: https://arducopter.googlecode.com/svn/trunk@1468 f9c3cf11-9bcb-44bc-f272-b75c42450872
Nuke AP_GPS_IMU, as nothing is using it anymore.
Simplify the handling of no GPS/no fix detection.
Fix prototypes for ::init and ::read.
Update AP_GPS_Auto and corresponding example, nearly ready for primetime.
Use uint8_t rather than byte.
Strip some _error() calls to save space. More could still go.
git-svn-id: https://arducopter.googlecode.com/svn/trunk@1246 f9c3cf11-9bcb-44bc-f272-b75c42450872
hazyhxj@gmail.com
james.goppert
DrZiplok@gmail.com
paulbmather@gmail.com
jasonshort