Add DOP.
Added RXM-RAW message logging (Ublox 6T).
Now logging Ublox RXM-SFRB msg as UBXN (N is for NAV data subframe).
Changed GPS pseudorange and carrier phase to doubles in logs.
Merge branch 'AC3.2-SM-TCGPS' of https://github.com/svc-smclaughlin/ardupilot into AC3.2-SM-TCGPS

Conflicts:
	libraries/AP_GPS/AP_GPS_UBLOX.cpp
	libraries/AP_GPS/AP_GPS_UBLOX.h
	libraries/DataFlash/DataFlash.h