Serials: Add some missing permacrud permissions to IDL

Serials: Add some missing permacrud permissions to IDL

7 classes (sdistn, siss, sunit, sin, sbsum, sssum, sisum) were missing IDL
perms.  Appropriate permissions were added to all but sin (serial_item_note).

For the sin class, since it's several leaps away from anything that points at
an org unit, and since no existing code deals with it via PermaCrud, its
PermaCrud section was simply removed.

Some classes retain open <retrieve /> permissions, and others do not.

No new permissions were created for this. All permissions are reused from
"higher" serials objects.

Credit to Mike Rylander for spotting the omissions.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@19325 dcc99617-32d9-48b4-a31d-7c20da2025e4