adding provenance links to GO kidney paper
 NT: angle of oral opening
 Started obsoleting cell parts, in prep for #489
 Started work on improving zygomatic muscles, using FEED. Issue #492, #491
 * NTs: skin of lower lip, upper lip
 * NTs for ligaments of middle ear
 * relaxed taxon constraint for loop of henle
 * added link to phalanges from digits
tidying
cmt2pvs
tidying
cmt2pvs
tidying
tidying
tidying
extracted source from PVs
 * Tidying of textual definitions
 * Improvements to histology, particularly skin and adnexa, from ISBN10:0123813611