* app/drawable_cmds.c
   * tools/pdbgen/pdb/drawable.pdb: The PDB procedures
     gimp_drawable_is_[layer|channel|channel_mask] were not renamed,
     but changed all over the place. This made the rotate plug-ins
     fail.

   * app/procedural_db.c: Spit out a warning if a procedure wasn't
     found in the PDB. Actually free the hash_table entries on
     procedural_db_free().

--Sven