Updated python version requirement to 2.3

Ready for 0.7.0 release! Small final fixes and manual cleanup (raised font size to 11, the pdf was hard to read).

Add egg support.

Arnd's wxversion support.

Apply Prabhu's patch for traits tab completion.

fix tab-completion bug in embedded ipython reported by Arnd

Small fix in ultraTB, and fix autocall. Add Scott's patch (issue 48) to fix the new fix_syntax hook. I started updating the copyright notices, but I don't really think that's worth doing or even necessary (adding the 2006 year mark). That's why so many files appear changed, though the functional diff is fairly small.

Fix gtk threading bug

fix small bug in traceback building

fix cd -b crash (patch by Ville)