[Distutils] Deprecate MANIFEST.in

[zooko]

> One particular annoyance is that the svn integration built-in to  
> setuptools tends to break every time a major release of Subversion  
> comes out (e.g. setuptools broke when 1.5 came out, is probably  
> currently broken with 1.6, etc.). The "stable" version of setuptools
> was broken wrt. svn 1.5 for so long that someone made a temporary  
> fork of setuptools and provided a svn 1.5 compatible build. It was  
> annoying to say the least, because it prevented us from upgrading  
> to 1.5 for a while.

I'm the maintainer of the setuptools_darcs plugin, and it broke when  
darcs v2.0 came out, but since it is a little separately-packaged  
plugin it was easy for me to fix it and distribute a fixed plugin.

Regards,

Zooko