I thought I had all tests passing with memmap enabled by default, but apparently I didn't?  Setting the default back to memmap=False until I can get these bugs hammered out (most tests still pass except for a few corner cases)
I thought I had all tests passing with memmap enabled by default, but apparently I didn't?  Setting the default back to memmap=False until I can get these bugs hammered out (most tests still pass except for a few corner cases)

git-svn-id: 5305e2c1a78737cf7dd5f8f44e9bbbd00348fde7@1170 ed100bfc-0583-0410-97f2-c26b58777a21

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