initial support for "earth" style particle display
improve grib record logic for undefined values
finalize initial particle map support
correct value for printf format
correct error in return logic
correct bounding calculation for grib barbs and numbers
fix case of lines wrapping the wrong way around the world
Adding igore files.
Adding control if the compiling system has opengl or not.
Merge pull request #162 from seandepagnier/grib-earth

Grib earth
Merge pull request #163 from seandepagnier/master

A few small bug fixes
Merge pull request #164 from NicolasJourden/master

OpenCPN compilation crash if OpenGL is not present.
Correct rendering of skewed polyconic raster charts (FS#1532)
Correct occasional chart info window display error. (FS#1500)
Rename Ivory Coast to Ivory coast to be consistent with the rest of the country names being in English and prevent minor problems with gettext.
fix logical error which also breaks the build on windows
add geometry include which is needed only on windows
Merge pull request #166 from seandepagnier/master

a few errors now resolved when compiling particle map on windows
Correct introduced bug from 99fae02ed30f9bbf1055b27b493448fab772faa4

in GribRecord.cpp hasValue is used when reading the grib file, even
if the value is not defined.  It is also used in other places,
where it needs to test that the value is also defined.
Correct Tide/Current station selectable point logic (FS#1473)