Python API documentation generation tool Code

- Fixed silly typo

- Fixed silly typo

- Added --graph-image-format option

- Changed the usage for to_html() and to_latex() methods -- they now
accept a directory, rather than an image filename (and a url in
the case of to_html). This is in preparation for adding an option
to specify the image format for graphs in html output.

- Changed the usage for to_html() and to_latex() methods -- they now
accept a directory, rather than an image filename (and a url in
the case of to_html). This is in preparation for adding an option
to specify the image format for graphs in html output.

- DotGraph's write() render() and html() methods now auto-select the
output format (gif, png, etc) based on the filename. Default=gif.

- Moved PYTHONPATH statement up

- Updated description of \EpydocIndex command

- Changes to make graph colors user-customizable.

- Use the xkeyval package to add two new keyword options to the epydoc
sty file (title and creator), which are used to set the hyperref
options pdftitle and pdfcreator.

- Use conditional test to decide whether the dvips or pdftex option
should be pased to the hyperref package. The generated latex output
no longer hard-codes information about the driver (so the same
latex output can be used by both latex and pdflatex).

- The preamble in the generated api.tex now *just* uses the selected
epydoc sty package. (the \uepackage statements for the hyperref
and graphicx packages were changed to \RequirePackage statements
in epydoc-base.sty.)

- Fixed bug where nested classes were not being documented.

- Fixed several bugs with index generation

- Fixed \ProvidesClass statements in epydoc-*.sty files