Specializes a theorem zero or more times, with type instantiation if necessary.
DESCRIPTION
IPSPECL is an iterative version of IPSPEC
A |- !p1...pn.tm
---------------------------- IPSPECL ["q1",...,"qn"]
A |- t[q1,...qn/p1,...,pn]
(where qi is free for pi in tm).
FAILURE
IPSPECL fails if the list of terms is longer than the number of
quantified variables in the term, if the type instantiation fails, or
if the type variable being instantiated is free in the assumptions.