matplotlib Code

- Fixes to main book so it compiles to PDF directly from LyX, without having
to use the kludgy lyxport script at all.

- Update some of the examples with minor fixes.

- Add new workbook directory. For now, I added the .tex files as well,
though they are generated from LyX, so John can use the system without LyX
while I'm gone. Once I'm back, we can decide how to best do this in the
long run.

Put in changes that for some reason SVN was not seeing in my local copy. Problem reported by Stefan

cleaner fill implementation

Small optimization.

Add energy display in the same units as the potential

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

Add Stefan's latest lsys code

Add L-system example contributed by Stefan van der Walt

added new examples and skels