matplotlib Code

deprecated mlab2 functions from mlab

removed mlab2 functions

Moving "event loop" stuff from blocking_input.py to backends. For backends
without a GUI, the default is to throw a NotImplemented error. For backends
with a GUI, I have implemented a "start/stop_event_loop_default" that does
the default event loop using time.sleep. For WX, I have used the code
supplied by Paul Kienzle, but I have been unable to check it because that
backend currently doesn't work for me.

Committing rewrite of clabel inlining and label rotation code. Also, renaming
ContourLabeler attributes to something like .labelAttribute. A few of the old
attribute names have been maintained (in addition to new versions) for
backward compatibility, but these should be remove in +1 releases.

Added appropriate comments to CHANGELOG and API_CHANGES.

Slight documentation changes.

Changes to documentation of norm and orth functions and deprecation
warning for norm in favor of numpy version.

Update barb_demo.py to exercise more of the possible parameters for wind barb plots. Replace some confusing code for passing in the data with more explicit arrays. Also, make the data array for the arbitrary grid non-square so that proper dimensioning can be seen. Remove mysterious windows-styles line endings.

restored broken barb demo

restored interactive_bk var to backends init -- ipython shell uses it

Fix to is_scalar plus additional functions in cbook.py:

less_simple_linear_interpolation
isvector
vector_lengths
distances_along_curve
path_length
is_closed_polygon