Python API documentation generation tool Code

- Moved code that resolves 'auto' pdfdriver to the write_latex
function.
- 'auto' pdfdriver now selects 'latex' if 'dvi' or 'ps' output are
requested
- if pdfdriver is set to 'pdflatex' and the dvi or ps output are
requested, then signal an error

- Replaced ._pdflatex with ._pdfdriver

- Rewrapped lines >80chars
- Removed stale (commented-out) code

- Fixed bug where graphs in latex would mark nodes as undocumented

- Supply context info when rendering docstrings to latex

- Fixed latex bug in SHADED stylesheet

- Added Jonathan Guyer to the contributors list

- Fixed typo from previous checkin

- Added dotgraph support to epytext's latex output
- Added dotgraph support to rst's latex output
- DotGrah.to_latex() now writes both the .eps and the .pdf file
(no language switch)
- Fixed bug in dotgraph when context=None
- Fixed bug in dotgraph in call to mk_valdoc_node
- Fixed bug in epytext in graph raising

- --graph=classtree and --graph=umlclasstree are now supported by
the latex writer.