2013-09-03

    * removed some stringent constraint axioms to a separate ontology (pendind-disjoints.owl) until ssAO issues fixed
    * NT: stomodeal ectoderm, and various modifications of relations and definitions surrounding the mouth. Addresses issue #326
    * NT: palatine aponeurosis
    * XAO xref for pharyngeal mesenchyme, adapted xao definition for uberon
    * adding cumbo slim, external def for cell group, CNS, brain, cell layer
 * NTs: cloacal muscles
 * Removed redundant synonym. Fixes issue #329