added an intro lemma for freshness of products; set up
the simplifier so that it can deal with the compact and
long notation for freshness constraints (FIXME: it should
also be able to deal with the special case of freshness
of atoms)
use "../settings.ML";
use_thy "Even";
use_thy "Mutual";
use_thy "Star";
use_thy "AB";
use_thy "Advanced";