matplotlib Code

Eliminate wiggly baseline compensation. Seems to work without it now -- have no idea why it was needed before.

contour: refactoring by Ian Thomas to facilitate new tricontour functionality

Fixed a problem in the last commit

backend_bases: handle facecolor [0,0,0,0] in patch collection; fixes 2881485

backend_ps: fix file perms when TeX is used; minor clarifications

Added the ps temp file ipermissions copy fix (as discussed on the devel list).

fix a bug that _bbox_patch of annotation is not correctly updated

modify axes_grid toolkit examples to use axes_grid1 and axisartist

add axes_size.py in axes_grid

rebase axes_grid using axes_grid1 and axisartist modules