remove old hard-wired URLs for cutouts

Apparently this method doesn't work any more
clean up using dictionaries, from JJ's version
need this cutout check regardless of cadc_short_cut
we will get a 404 here if the file doesn't exist, so raise exception
turn on cadc_short_cut for vofs, with full negotiation as fall back

Use the faster short cut methods for obtaining URLs to files using
a single redirect. If it fails when it comes time to follow that
URL a second call to getNodeURL will happen with the new
fullNegotiation flag set.
some extra clarification