Fix several warnings reported by clang++ 3.2.

* src/tgba/tgbakvcomplement.cc
(tgba_kv_complement_succ_iterator::current_state_),
src/ta/taexplicit.hh (state_ta_explicit::source_):
Remove useless private member.
* src/ta/taexplicit.cc: Adjust constructors.
* src/ta/tgta.cc, src/ta/taexplicit.hh: Also fix
copyright banner.
* src/bin/ltlcross.cc (exec_with_timeout): Work
around warning about status not being set in the
error path.

src/bin/ltlcross.cc

 // -*- coding: utf-8 -*-
-// Copyright (C) 2012 Laboratoire de Recherche et Développement de
-// l'Epita (LRDE).
+// Copyright (C) 2012, 2013 Laboratoire de Recherche et Développement
+// de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -393,6 +393,8 @@ exec_with_timeout(const char* cmd)
       setpgid(0, 0);
       execlp("sh", "sh", "-c", cmd, (char*)0);
       error(2, errno, "failed to run 'sh'");
+      // never reached
+      return -1;
     }
   else
     {

src/ta/taexplicit.cc

 // -*- coding: utf-8 -*-
-// Copyright (C) 2010, 2011, 2012 Laboratoire de Recherche et
+// Copyright (C) 2010, 2011, 2012, 2013 Laboratoire de Recherche et
 // Développement de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
@@ -43,15 +43,13 @@ namespace spot
   // ta_explicit_succ_iterator
 
   ta_explicit_succ_iterator::ta_explicit_succ_iterator(
-      const state_ta_explicit* s) :
-    source_(s)
+      const state_ta_explicit* s)
   {
     transitions_ = s->get_transitions();
   }
 
   ta_explicit_succ_iterator::ta_explicit_succ_iterator(
-      const state_ta_explicit* s, bdd condition) :
-    source_(s)
+      const state_ta_explicit* s, bdd condition)
   {
     transitions_ = s->get_transitions(condition);
   }

src/ta/taexplicit.hh

-// Copyright (C) 2010, 2011, 2012 Laboratoire de Recherche et
-// Developpement de l Epita_explicit (LRDE).
+// -*- coding: utf-8 -*-
+// Copyright (C) 2010, 2011, 2012, 2013 Laboratoire de Recherche et
+// Développement de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -9,9 +10,9 @@
 // (at your option) any later version.
 //
 // Spot is distributed in the hope that it will be useful, but WITHOUT
-// ANY WARRANTY; without even the implied warranty of MERCHANta_explicitBILITY
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 // or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-// License for more deta_explicitils.
+// License for more details.
 //
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
@@ -265,7 +266,6 @@ namespace spot
   private:
     state_ta_explicit::transitions* transitions_;
     state_ta_explicit::transitions::const_iterator i_;
-    const state_ta_explicit* source_;
   };
 
 }

src/ta/tgta.cc

-// Copyright (C) 2012 Laboratoire de Recherche et Developpement
-// de l Epita_explicit (LRDE).
+// -*- coding: utf-8 -*-
+// Copyright (C) 2012, 2013 Laboratoire de Recherche et Développement
+// de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -9,7 +10,7 @@
 // (at your option) any later version.
 //
 // Spot is distributed in the hope that it will be useful, but WITHOUT
-// ANY WARRANTY; without even the implied warranty of MERCHANta_explicitBILITY
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 // or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
 // License for more deta_explicitils.
 //
@@ -29,5 +30,3 @@ namespace spot
 
 
 }
-
-

src/tgba/tgbakvcomplement.cc

-// Copyright (C) 2009, 2010, 2011 Laboratoire de Recherche et Développement
-// de l'Epita (LRDE).
+// -*- coding: utf-8 -*-
+// Copyright (C) 2009, 2010, 2011, 2013 Laboratoire de Recherche et
+// Développement de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -278,7 +279,6 @@ namespace spot
       bdd the_acceptance_cond_;
       const acc_list_t& acc_list_;
       const state_kv_complement* origin_;
-      const state_kv_complement* current_state_;
       bdd_list_t condition_list_;
       bdd_list_t::const_iterator current_condition_;
       state_rank_map highest_current_ranks_;