[unwrap].
'Command examples:       CHECK|: unwrap.'.
'                        CHECK|: unwrap h#4.'.
'                        CHECK|: unwrap c#1.'.
''.
'With the "unwrap" command, the user may "unwrap" the outermost quantifier'.
'of a hypothesis or conclusion of the current VC, where this is possible.'.
'Note that in certain cases -- an existentially quantified hypothesis or'.
'a universally quantified conclusion -- the quantified formula must be free'.
'of universal variables (i.e. all such variables must have been instantiated'.
'in these cases before further unwrapping is permitted).'.
