corrections to opengl route rendering
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN into optimum-merging
Correct S52Plib raster symbol table initialization sequence.
Merge pull request #118 from seandepagnier/optimum-merging

Optimum merging -- improved corrections from chucksk for route rendering
Fix end of NMEA sentence received from a datastream in case no checksum is present
Correct OpenGL Route/Waypoint rendering logic
Merge branch 'master' of github.com:OpenCPN/OpenCPN
Correct canvas Refresh() logic when OpenGL FBO is in use.
Eliminate flashing on Windows OpenGL canvas rollover & Refresh().