fat pad synonyms
null changes
null changes; rearranging stanzas
modifying relationships and label for hypodermal muscle layer (muscle is now located in adipose tissue rather than a part)
merged hypodermis fat layer into subcutaneous adipose tissue
modified axioms for dorsal fin - was in_median_plane_of some dorsum, changing to median plane of organism and a separate axiom for part_of dorsum. Addresses #262