Fix incorrect link in OSX instructions.

Close http://www.scipy.net/roundup/ipython/issue40, add OSX install info to manual.

* IPython/iplib.py (runsource): remove self.code_to_run_src attribute. I realized this is nothing more than '\n'.join(self.buffer), and having the same data in two different places is just asking for synchronization bugs. This may impact people who have custom exception handlers, so I need to warn ipython-dev about it (F. Mantegazza may use them). * Fix http://www.scipy.net/roundup/ipython/issue38

Minor improvements, to add changeset info.

Fixed log hook to check against HEAD so the email is more informative.

Added new little utility for wrapping svn commits with email notifications, til we have trac/svn hooks in place.

fix to help users with invalid $HOME under win32.

Unicode fixes (utf-8 used by default if ascii is not enough). This should fix some reported crashes. Fix broken auto-quoting for pysh. Remove old 2.1 specific hacks and move all 2.2 compatibility symbols into genutils. Simplify i/o abstraction layer a bit. Full details in changelog.

Make a global variable out of the color scheme table used for coloring exception tracebacks. Thanks to a patch by pabw, see http://www.scipy.net/roundup/ipython/issue35.

Close http://www.scipy.net/roundup/ipython/issue34 with slightly modified patch (filter non-strings from tab completions).