Merge pull request #72 from mdboom/fix-use-after-free-error

Fix memory-access-after-free bug.

git-svn-id: http://svn6.assembla.com/svn/pyfits/trunk@2781 ed100bfc-0583-0410-97f2-c26b58777a21
These calls to np.fromstring were bugging out on Python 3.1, very strangely.  But bugs in Numpy on Python 3.1 are nothing new, and there was no longer any need for the np.fromstring call there, so this is fine for now.

git-svn-id: http://svn6.assembla.com/svn/pyfits/trunk@2782 ed100bfc-0583-0410-97f2-c26b58777a21
Skip another checksum related test on Windows.

git-svn-id: http://svn6.assembla.com/svn/pyfits/trunk@2783 ed100bfc-0583-0410-97f2-c26b58777a21