Updated the notes at the beginning of the compression module, and removed all the old code. It can be looked up through version control if it needs to be referred to at this point.  Removed a couple TODO comments that were outdated.
Updated the notes at the beginning of the compression module, and removed all the old code. It can be looked up through version control if it needs to be referred to at this point.  Removed a couple TODO comments that were outdated.

git-svn-id: 5305e2c1a78737cf7dd5f8f44e9bbbd00348fde7@1915 ed100bfc-0583-0410-97f2-c26b58777a21

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