Dont tidy up tyvars after :print type reconstruction
I introduced a bug yesterday when I changed the way tidying up was performed. As a result of tidying, cvObtainTerm could be returning types with regular tyvars inside, which never should. But actually, it's better if we do not do the tidying up, in order to keep the tyvar names from the environment. New names will be introduced only when an existential is found, which is not so common. In this case the user will see a funny name. Is that really an issue?