Applies a consequence conversion to the body of a
universally-quantified term.
DESCRIPTION
If c is a consequence conversion that maps a term ``t x``
to a theorem |- t x = t' x, |- t' x ==> t x or |- t x ==> t' x, then
FORALL_CONSEQ_CONV c maps ``!x. t x`` to
|- !x. t x = !x. t' x, |- !x. t' x ==> !x. t x or
|- !x. t x ==> !x. t' x, respectively.
FAILURE
FORALL_CONSEQ_CONV c t fails, if t is not an all-quantified term or
if c fails on the body of t.