some fixes for numpy svn deprecation warnings
Minor simplification.
Minor docstring fix.
Fix non-linear scaling with pcolormesh and non-Agg backends.
Remove possibility of buffer overrun in last commit.
Fix problem with NaNs at end of path.
Reverting last (accidental) commit.
update nan example to demonstrate bug
Merged revisions 5771 via svnmerge from https://matplotlib.svn.sourceforge.net/svnroot/matplotlib/branches/v0_91_maint
........ r5771 | dsdale | 2008-07-17 08:01:50 -0400 (Thu, 17 Jul 2008) | 2 lines improve error reporting in texmanager ........
improve error reporting in texmanager
