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
Teach AP_GPS about FastSerial (in the few places it needs to know) and about Stream everywhere else.
Do some minor code cleanup.
Tested with Mega and uBlox. Some issues (e.g. reporting 0 satelites) remain.
git-svn-id: https://arducopter.googlecode.com/svn/trunk@404 f9c3cf11-9bcb-44bc-f272-b75c42450872
deweibel@gmail.com
DrZiplok@gmail.com
jasonshort