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().
fix builtin region class to use because of memory corruption issues with wxRegion class
fix color swapping issue for each mipmap level for compressed textures in windows
fix build to work without wxUSE_GRAPHICS_CONTEXT
fix build to work without ocpnUSE_GL