Python API documentation generation tool Code

- Fixed typo

- Bumped version alpha3 -> beta1

- Minor updates to what's new page

- Don't fail if docutils module isn't available -- the DocUrlGenerator
class may still be useful.

formatting changes to the webpage

- Various formatting & css changes for the manual
- Added navbar to the bottom of generated manual html pages

- VariableDoc's containing routines with overrides != None should
return true for is_detailed()

- Added missing import statements (SF bug 1669525)

- Added :term: reST iterpreted text role to create indexed terms as X{...}
epytext markup.

- Fixed --no-frames option: frames and relative links are really not generated.
- Don't generate links for toggle_private() when --no-private option is used.