Exporting regexp-match?.
Default conf parent is #f, not null.
Fixing some bignum length comparisons.
GC-preserving intermediate sexp_fixnum_to_bignum result in sexp_expt.
Patch from Lorenzo.
Documentation clarification on the arguments to sexp_alloc_tagged from Lorenzo.
Patch from Per Bothner for => in non-terminal case clauses.
Additional list-copy tests from Per Bothner.
Fixing list-copy for improper lists.