addition of brain regions from NIF
removed annot props from nif-sourced classes
    NT: intermammary cleft, line; left and right nipple
    NTs for blood in vessel types (venous, arterial, capillary)
    NT: common crus
    multiple additional synonyms
    addition of brain regions from NIF
    NT: layer of skin - groups many existing classes
    addresses #205
NT: future telencephalon. Refactored future forebrain parts
fibroelastic membrane of larynx
null
Fixes #245