JSA::Files: handle conversion of FITS pub tiles

This adds the corresponding patterns to dissect_cadcfile and
cadc_to_drfilename.
jsawrapdr: rescan after converting FITS inputs

The directory should be scanned to re-generate the "post retrieve"
file list after conversion of input FITS files.  This is to prevent
the converted files being mistaken for new products.
jsawrapdr: ensure retrieved files are cleaned up

The list of retrieved files is now saved so that at the pre-capture
clean-up stage, jsawrapdr can ensure that they have all been
deleted.  This is so that when working with reduced data, the
original FITS files are not sent back to CADC.