Some more fixes to the tdump and tcreate functions.  This all needs to be backported to the release branch.
Some more fixes to the tdump and tcreate functions.  This all needs to be backported to the release branch.

git-svn-id: 5305e2c1a78737cf7dd5f8f44e9bbbd00348fde7@973 ed100bfc-0583-0410-97f2-c26b58777a21

embray/PyFITS,spacetelescope/PyFITS,embray/PyFITS,embray/PyFITS,embray/PyFITS,spacetelescope/PyFITS