log_data.o added
PALT and PRVX deleted
loh_data.h added. file opened and checked if it's opened.
Data logger.
Merge branch 'master' of https://github.com/birkiro/mdbGPSpilot into data_logger
Distance Too Great Formula corrected
changed  if statement to while for distance  above 500m
adding a comment to distance above 500
logdata() function uncommented
Altitude controller implementation
Merge branch 'master' of https://github.com/birkiro/mdbGPSpilot

Conflicts:
	Arduino/mdbPilotbasic/mdbPilotbasic.ino