Make sure distribute_setup.py is included in the manifest.in.

git-svn-id: http://svn6.assembla.com/svn/pyfits/branches/3.1-stable@2193 ed100bfc-0583-0410-97f2-c26b58777a21
Assigning inf and nan as header values simply shouldn't be allowed for now, as this is undefined by the FITS standard (and the previous behavior was nonsensical anyways).  Later this will be allowed optionally.


Conflicts:

	lib/pyfits/tests/test_diff.py

git-svn-id: http://svn6.assembla.com/svn/pyfits/branches/3.1-stable@2194 ed100bfc-0583-0410-97f2-c26b58777a21
Added the notice about PyFITS' future that I've been plastering everywhere I can think to.

git-svn-id: http://svn6.assembla.com/svn/pyfits/branches/3.1-stable@2213 ed100bfc-0583-0410-97f2-c26b58777a21