some optimizations for orthographic projection
Fix rcParams bug.
Make safezip accept more args; quadmesh_demo cleanup
make step_demo use npyma
Minor cleanup; removed old ipython hack.
support for orthographic
Make STIX fonts work.
fix for coastline segments that jump across plot.
fixes for non-fulldisk geos and ortho, cleanups in _getmapboundary
First pass at getting STIX fonts to work. Support .otf fonts in font_manager.py
