matplotlib Code

cleaner fill implementation

changed pcolor default to shading='flat'; related cleanups

Small optimization.

Add energy display in the same units as the potential

Add Schrodinger equation example, contributed by James Nagel <nagel@...>

tweaked cbook.dedent, inspired by Fernando's version

added config module, for testing a traited config system

Numpy has isfinite, unlike the old numerix

Some examples to go with the last commit.

Lots of sizing and layout tweaks. Support $\sqrt[3]{foo}. The line
meets up with the check mark rather clumsily on the Agg backends due
to rounding errors and lack of subpixel placement... will look into that.