Add code chunk to modify the DATASEC keyword so it is correct for the cutout chunk.  This allows DS9 to ignore the trim section during display, making scaling more consistent.
Switched the sequence used to pull a new header from the dbimages area to make use of the new CADC 'fhead' mechanism.  This imporves the speed of header retrieval and make the headers more complete.
Added a PREFETCH.NUMBER configuration setting that sets the number of files ahead that the application attempts to fetch.  Default set to 5.