FIXED: library(apply_macros): expanding maplist(SomeMetaPredicate, ...)
was just `mostly correct'. This, together with the fact that sandboxing
cannot deal with the required transparent directive and there is
apparently some inner meta-calling, which makes getting rid of the outer
meta-calling less important made me decide not to expand maplist/N if
the argument is a meta-predicate.  Found by Markus Triska, nesting
maplist calls.