Fix masked array plotting again.
Removing a limits change that shouldn't have been committed.
Forgot to svn add these files in last commit.
Separated path utilities from backend_agg
Bugfix: save colorbar axis label so it won't get lost
Fix bug affecting legend_auto.py
Fix bug in clipping rectangle in PDF
Reduce tendency to use aliased drawing.
Fix bugs in log_demo.py
Fix bug that broke draw_image
