geeksville/Gaggle — pull request #70 by relet (2012-06-30 08:14:56+00:00)
Title: Display Barometer status, and FlyNet tweaks

A simple status message that can display the name and/or status of the barometer used next to the reading.

For FlyNet, it displays "? FlyNet" if the driver is chosen, but it is searching the device, and "+ FlyNet" if it is connected and has readouts.
For the other barometers, I set a default status message to "CNET" or "int." respectively.

Also, disables FlyNetBarometer observer thread when no observers are present, to conserve battery.

Flight tested at: http://www.paraglidingforum.com/leonardo/flight/628649 ;)