Make final 6 arcsec image

When doing hba selfcal, I think it would be useful for the finalize.cwl workflow to include 6" imaging (as well as, or optionally instead of, the 40" imaging) at the end of LINC target. This makes it useful to compare the self-calibrated images after calibration against TGSS (for which a 6" image is produced).

This would also be a useful image to provide as a starting point for DD self-cal (e.g. with Rapthor)