Rename delSpec to graphSpec
Remove /Fileset recursion and set SOFT
Remove +FS logic in graphs (Fix #10776)

For previous FS milestones, /Dataset and /Image specs
were modified to automatically handle the extra objects
linked to by /Filesets, including other images. With these
changes, that logic has now been completely removed.

Instead, the /Fileset relationship is marked SOFT so
that in order to pass chgrp validation, it is necessary
to have all /Images moved at once.

Current limitations:

 * https://trac.openmicroscopy.org.uk/ome/ticket/10846
   Multiple failing filesets will not be detected.

 * https://trac.openmicroscopy.org.uk/ome/ticket/10847
   Passing individual images will not succeed.
NB: Change PARSER log level to ERROR

Since "FATAL" is no longer a valid level, the
PARSER log level was being set to DEBUG.