altoslib: When GPS disappears, set range and elevation to MISSING
authorKeith Packard <keithp@keithp.com>
Sat, 14 Jun 2014 21:34:59 +0000 (14:34 -0700)
committerKeith Packard <keithp@keithp.com>
Sat, 14 Jun 2014 21:34:59 +0000 (14:34 -0700)
Use MISSING instead of bogus values so that displayers can tell what
to do.

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

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