fix how (unify) deals with more than 2 values
zebra striping
support passing debug=true for more diagnostics
fix (sentence): dereference lexicon
make italianverbs.pos.italiano referable from here
use unifyc rather than less clear equivalent (lexiconfn/unify)
eat (past) -> ate
fix merge in (trans-intrans): prefix path to :obj with {:synsem}.