[matplotlib-devel] Hatching support

I've refactored hatching support to move the hatch design itself to the 
core, added support for them in the Agg and SVG backends, and simplified 
their usage in the PDF and PS backends.  It should now be easier to add 
new hatch styles if anyone ever feels artistic.

In order to use the same general approach in all backends, the PS 
backend now uses the makepattern command rather than a loop to draw each 
hatch line.  That may be a regression in certain situations (eg., old PS 
printers without enough memory).  So those who were using the old PS 
backend with hatches should test the new approach and report any problems.

Mike

-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA