Merge pull request #1 from vranki/master

Changes from vranki
Lat/long simulated datarefs
Merge pull request #2 from vranki/master

Changes from vranki
New simulated data refs...
Merge branch 'master' of github.com:dankrusi/ExtPlane-Panel
Saving and loading of panel files. The last loaded file is automatically loaded on startup. TODO: Dirty panel warning/confirmation.
Merge pull request #4 from dankrusi/master

Some new simulated data refs for testing...