make :cat available to morphology by putting it inside the :english and :italian features.
working on noun morphology
add TODO comments: re: disabled functionality in (unify)
pass :cat along to :italian and :english so that morphology can use it if necessary.
better detection of where to add next child (look at :1 :italian :root).
working on making nouns rootless, in addition to ongoing work for verbs.
adjectival predicate percolated to head's semantics.