Improve Options->Connections port management to avoid unnecessary closing and re-opening of ports.
On Windows, perform simple test of OpenGL functionality before enabling globally.
Merge branch 'master' of github.com:OpenCPN/OpenCPN
Corrected some missing translatable strings.
Avoid non-fatal assertion warning on Mac platforms.
Correct TrackProperties Dialog Z-order.
Validate existence of chart stack to avoid asynchronous fault.
Avoid potential fault on non-existing thumbnail window
Correct Bluetooth (Windows) port initialization timing (FS#1006)
Add Log message just prior to OpenGL initialization.
Always render ownship as yellow when chart accuracy is known to be low. (FS#1116)
Correct Options->AIS CPA/TCPA warning checkbox logic (FS#965)
Improve Air Temperature rendering
Suppress Quickscat option
Improve unit display and calculation
Merge pull request #76 from Ptizef/master

Improve Air Temperature rendering
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN into devga

Conflicts:
	src/options.cpp /ga vu