Fix DISABLE_GOOGLE_EARTH
Fix broken connect
Fix warning
Remove signal overrides
Merge pull request #1040 from DonLakeFlyer/SignalOverride

Remove signal overrides
Correctly initialize floats as NaNs where expected.
Merge pull request #1039 from DonLakeFlyer/ConnectFix

Fix broken connect
Merge pull request #1038 from DonLakeFlyer/DISABLE_GOOGLE_EARTH

Fix DISABLE_GOOGLE_EARTH
Merge pull request #1047 from Susurrus/pfd_init_fix

Correctly initialize floats as NaNs where expected.
Hopefully fix thread safety issue

Operator = is not thread-safe, but copy constructor looks to be. This
is causing an intermittent crash.
Merge pull request #1051 from DonLakeFlyer/MapThread

Hopefully fix thread safety issue in opmapcontrol
Merge remote-tracking branch 'upstream/master' to master.
Merge branch 'master' into improve_instruments_panel
Fixed wrong path for my Qt config.