matplotlib Code

fix Antarctic polygon closing code

optimize code for closing Antarctica

add to list of projections that can't cross pole,
close Antarctica for all that don't.

some projections should never cross pole.

fix Antarctica for 'geos' projection, use npy.sum not python built-in,
refine checks for bad polygons to avoid 'Bus errors' in ctypes libgeos
interface.

more comments in _readboundar method

refine check for bogus polygons in fulldisk ortho projection.

docstring cleanup, remove extra Shapely Polygon call.

remove last vestiges of numerix

cleanups in drawmapboundary