Sometimes corrupted NMEA messages can get passed the NMEA "CRC" check and this caused the NEMA parser to crash because it assumed that the correct amount of parameters are present.
Now the NMEA message is split into its different parameters before it is passed to the message-specific parser. Hence the function-signature of the parser functions has changed and the implementations of these functions has changed.
I also decided to no longer interpret the VTG and ZDA because they do not contain more data than the other messages that are being parsed.
Not tested in flight, and could not test the TOP message.
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@2904 ebee16cc-31ac-478f-84a7-5cbb03baadba
