Fix handling of PSL operators in reductions rules.

We still don't have any PSL-specific reductions, but at least
the LTL reduction now appear to work on PSL formulas.

* src/ltlvisit/basicreduce.cc (basic_reduce_visitor): Fix the
call to std::copy to handle Concat, Fusion, and AndNLM.
* src/ltlvisit/reduce.cc (reduce_visitor): Fix handling
of UConcat, EConcat, and EConcatMarked.
* src/tgbatest/randpsl.test: Activate reductions.
* src/ltltest/reducpsl.test: New file.
* src/ltltest/Makefile.am (TESTS): Add it.

src/ltlvisit/reduce.cc

@@ -157,10 +157,12 @@ namespace spot
 		case binop::Xor:
 		case binop::Equiv:
 		case binop::Implies:
+		  assert(!"operator not supported for syntactic implication");
+		  return;
 		case binop::UConcat:
 		case binop::EConcat:
 		case binop::EConcatMarked:
-		  return;
+		  break;
 
 		case binop::U:
 		  /* a < b => a U b = b */