update shape files.
Obsolete
update state shape files for fillstates.py
another fix for Mercator
clip plot region to be within -89.99S and 89.99N for Mercator
changed version
Check that default values of llcrnrlat and urcrnrlat are not used for Mercator
raise exception if llcrnrlat or urcrnrlat are at poles for mercator
make ticker.py draw correct minus signs with usetex
don't run warpimage.py
