remove unused texture from ocpndc
improve performance as well as appearance of thick line rendering
variable step count ellipse, use faster float since double is not needed, cleanup unused code, and a few rendering corrections
Fix introduced bug I missed do to merging.
correct end cap rendering logic
corrections to drawing thick lines
Extend API 1.11
Revert OpenGL text render method for National (UTF-8) character strings.
Merge branch 'master' of github.com:OpenCPN/OpenCPN
Merge pull request #112 from seandepagnier/optimum-merging

Optimum merging
3.3.1710, Optimum merge
Merge pull request #111 from Ptizef/master

Correct colored overlays display in OpenGL mode
Correct possible NULL deref crash on quilt zoom-in.
Correct possible NULL deref on incompletely specified route.
Correct for potentially malformed AIS strings.
Increase memory object dump context on Windows CrashReport
enhanced smooth movement, improved logic, and added arbitrary rotations
Correct 'moving grib' detection - Ovoid files with several resolutions
to be declared as 'moving grib' files
Correct font parameter setting logic.
In CMake, allow $PREFIX command line override.