Correct PlugIn Toolbar icon management.  (FS#1174)
Correct fault on deleting point from route while Properties dialog active.
Correct startup option "-fullscreen" behavior. (FS#1180)
Improve PlugIn Blacklist detection logic.
Revert (partial) earlier commit concerning OpenGL stack optimization.
Correct True/Mag/Variation calculation algorithm.  (FS#1173)
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN