Fix translation of !{r}.

We need a marked version of !{r} to perform breakpoint unroling.

* src/ltlast/unop.cc, src/ltlast/unop.hh: Declare a NegClosureMarked
operator.
* src/ltlvisit/mark.hh, src/ltlvisit/mark.cc,
src/tgbaalgos/ltl2tgba_fm.cc: Adjust to deal with NegClosureMarked
and NegClosure as apropriate.
* src/ltlvisit/simplify.cc, src/ltlvisit/tostring.cc,
src/ltlvisit/tunabbrev.cc, src/tgbaalgos/eltl2tgba_lacim.cc,
src/tgbaalgos/ltl2taa.cc, src/tgbaalgos/ltl2tgba_lacim.cc,
src/tgba/formula2bdd.cc: Deal with NegClosureMarked in the same way as
we deal with NegClosure.
* src/tgbatest/ltl2tgba.test: More tests.
* src/ltltest/kind.test: Adjust.
* doc/tl/tl.tex: Mention the marked negated closure.

src/ltlast/unop.cc

@@ -112,7 +112,8 @@ namespace spot
 	  is.accepting_eword = false;
 	  break;
 	case NegClosure:
-	  is.not_marked = false;
+	case NegClosureMarked:
+	  is.not_marked = (op == NegClosure);
 	  is.boolean = false;
 	  is.ltl_formula = false;
 	  is.eltl_formula = false;
@@ -198,6 +199,8 @@ namespace spot
 	  return "Closure";
 	case NegClosure:
 	  return "NegClosure";
+	case NegClosureMarked:
+	  return "NegClosureMarked";
 	}
       // Unreachable code.
       assert(0);
@@ -297,6 +300,7 @@ namespace spot
 	  break;
 
 	case NegClosure:
+	case NegClosureMarked:
 	  // {1} = 0,  {[*0]} = 0
 	  if (child == constant::true_instance()
 	      || child == constant::empty_word_instance())

src/ltlast/unop.hh

@@ -47,7 +47,7 @@ namespace spot
 	// ELTL
 	Finish,
 	// Closure
-	Closure, NegClosure,
+	Closure, NegClosure, NegClosureMarked
 	};
 
       /// \brief Build an unary operator with operation \a op and