Add a "verify" keyword to append(), that, when False, assumes the existing FITS file is valid and merely appends a new HDU to the end.  This is much faster than the current behvaior which reads in and writes out an entire FITS file on each call to append().
Add a "verify" keyword to append(), that, when False, assumes the existing FITS file is valid and merely appends a new HDU to the end.  This is much faster than the current behvaior which reads in and writes out an entire FITS file on each call to append().


git-svn-id: 5305e2c1a78737cf7dd5f8f44e9bbbd00348fde7@702 ed100bfc-0583-0410-97f2-c26b58777a21

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