some optimizations for orthographic projection
support for orthographic
fix for coastline segments that jump across plot.
fixes for non-fulldisk geos and ortho, cleanups in _getmapboundary
fixed mollweide
fix Antarctica for moll,robin and sinu (moll still broken)
remove debug code
only read in state, country and river geometries when draw method invoked.
fixed for map projection regions that are not polygons in lat/lon coords
cleanup
