altoslib: Track GPS altitude values to be able to report max gps height
authorKeith Packard <keithp@keithp.com>
Sat, 25 Jan 2014 06:39:10 +0000 (22:39 -0800)
committerKeith Packard <keithp@keithp.com>
Sat, 25 Jan 2014 06:39:10 +0000 (22:39 -0800)
This adds separate GPS altitude and GPS ground altitude values so that
the AltosState object can report GPS max height.

Signed-off-by: Keith Packard <keithp@keithp.com>

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