Begin to implement the altimeter module
Work on vti_ps like for vti_as
Altitude - Put everything in the module
Pressure sensor - Moved stuff into vti_ps driver
Some work on the altitude module
- New SYSMSG for the pressure sensor
- Fix pressure driver
- Add a config flag to include or not pressure code
* Fix ifdef sections for accelerometer module
* make debug in Makefile launch "msp430-gdb gdb"

Conflicts:
	Makefile