[Distutils] Deprecate MANIFEST.in

[David Cournapeau]

P.J. Eby wrote:
> That means creating an installation manifest format that is 100%
> explicit, and then having tools (including distutils/setuptools
> commands, and plugins for other build systems) that can generate that
> manifest, as well as tools to install files according to different
> platforms' predilections.

I am 100 % in agreement with the above (I have been thinking a bit about
something a bit more powerful that MANIFEST and PKG-INFO for the
static-metadata, as a path for a 'next'-gen distutils, but I don't have
anything working yet),

cheers,

David