standardizing naming for stratum pyramidal layers
Added MA xrefs to existing terms for new MA terms
aligned additional MA terms
 * NTs for tusks
 * NTs: (multiple) lymph nodes
 * NTs: heel, heel skin
 * added NCITA xrefs
 * NTs: lymph nodes. Annotating comparative anatomy with mouse from PMID:16624319
 * NTs: multiple, for HPO logical definitions