[Distutils] Deprecate MANIFEST.in

[zooko]

Let me just throw in that my uses cases for all of my projects so far  
are:

1.  There should not be any file included in the distribution that  
isn't included under VCS.

1.a.  *except* that there is this one Python source code file named  
_version.py which is autogenerated from VCS and is not itself stored  
in VCS, documented here:

http://allmydata.org/trac/darcsver/browser/README.txt

2.  There should not be any file included under VCS that isn't  
included in the distribution.

Therefore, for me, setuptools's VCS-integration and  
include_package_data=True is perfect.

Regards,

Zooko