Merge pull request #46 from embray/issue-46

FITS File Writing Performance


Conflicts:

	lib/pyfits/header.py

git-svn-id: http://svn6.assembla.com/svn/pyfits/branches/3.1-stable@2417 ed100bfc-0583-0410-97f2-c26b58777a21
Add changelog entry for #46; I also decided not to backport it to 3.0.x as most of the changes won't apply well to the old Header code in that branch, and it's not really a bug fix anyways.


Conflicts:

	CHANGES.txt

git-svn-id: http://svn6.assembla.com/svn/pyfits/branches/3.1-stable@2418 ed100bfc-0583-0410-97f2-c26b58777a21