VP -> per + infinitive-verb works now
fix vp-past: was :fail before.
transitive-but-with-prepositional-phrase-instead-of-noun should not put restrictions on its object's subcat (e.g. "venuto per aiutarti")
venire takes 'per' e.g. "venire per aiutarti (come to help you)"
add expansion rule pp -> prep + VP[inf]
rewrite quickstart
merge with master
for now, hide :extend values from html because we have no good way to represent them
aiutare + ti => aiutarti
add "aiutare (to help)"
add support for v + vp[inf], e.g. "io sono venuto per aiutarti (I came to help you)"