matplotlib Code

added scikits.delaunay as matplotlib.delaunay, added griddata function to mlab.

Re-introduce offset_copy

Add get_offsets, set_offsets to Collection (Ryan Kraus)

In image.py, ensure input can be ndarray or MaskedArray (Klaus Zimmerman).
Masked 2-D arrays are handled automatically by the color mapping
framework, so they need to be passed through; but there is no
point in converting 3-D arrays into masked arrays because there
is no support for dealing with a mask in that case.

Fixing minor documentation problems in contour.py

Minor ginput_manual_clabel.py changes

Recommitting my changes to clabel to allow for manual labeling after fixing
problems with indexing identified by Eric Firing on 19 July 2008.

In addition, I have made the following changes:

1) Placed more comments in contour.py with the intention of eventually doing
a rewrite or restructuring of that code.

2) Added two pylab_examples: contour_label_demo.py that tests out some of the
more advanced things that can now be done with contour labeling, and
ginput_manual_clabel.py that demonstrates some uses of ginput,
waitforbuttonpress, and clabel(...,manual=True). The first of these has been
integrated into backend_driver.py, but the second cannot be because it
requires interaction.

Added Gael's backend fallback patch

Expanded delete_masked_points to handle more types of argument

Moved and modified axes_unit.py to cbook_unit.py.
At present it is only testing delete_masked_points,
which was moved from axes to cbook.