Test "ltl2tgba -FC" and plug the memory leaks of scc_map.

* src/tgbaalgos/scc.hh (scc_map::~scc_map): Declare it.
* src/tgbaalgos/scc.cc (scc_map::~scc_map): Implement it.
(scc_map::build_map): Delete duplicate states.
* src/tbbatest/ltl2tgba.test: Run ltl2tgba -FV to catch
memory leaks with valgrind.

src/tgbaalgos/scc.cc

@@ -44,6 +44,19 @@ namespace spot
   {
   }
 
+  scc_map::~scc_map()
+  {
+    hash_type::iterator i = h_.begin();
+
+    while (i != h_.end())
+      {
+	// Advance the iterator before deleting the key.
+	const state* s = i->first;
+	++i;
+	delete s;
+      }
+  }
+
   unsigned
   scc_map::initial() const
   {
@@ -182,6 +195,10 @@ namespace spot
 	    continue;
 	  }
 
+	// If we now the state, reuse the previous object.
+	delete dest;
+	dest = spi->first;
+
 	// Have we reached a maximal SCC?
 	if (spi->second >= 0)
 	  {

src/tgbaalgos/scc.hh

@@ -64,6 +64,7 @@ namespace spot
     typedef std::set<bdd, bdd_less_than> cond_set;
 
     scc_map(const tgba* aut);
+    ~scc_map();
 
     void build_map();
 

src/tgbatest/ltl2tgba.test

@@ -1,5 +1,5 @@
 #!/bin/sh
-# Copyright (C) 2003, 2004  Laboratoire d'Informatique de Paris 6 (LIP6),
+# Copyright (C) 2003, 2004, 2009  Laboratoire d'Informatique de Paris 6 (LIP6),
 # département Systèmes Répartis Coopératifs (SRC), Université Pierre
 # et Marie Curie.
 #
@@ -29,6 +29,7 @@ check ()
 {
   run 0 ./ltl2tgba "$1"
   run 0 ./ltl2tgba -f "$1"
+  run 0 ./ltl2tgba -f -FC "$1"
 }
 
 # We don't check the output, but just running these might be enough to