Move bdd_allocator to src/priv/.

* src/misc/bddalloc.cc, src/misc/bddalloc.hh,
src/misc/freelist.cc, src/misc/freelist.hh: Move ...
* src/priv/bddalloc.cc, src/priv/bddalloc.hh,
src/priv/freelist.cc, src/priv/freelist.hh: ... here.
* src/misc/Makefile.am, src/priv/Makefile.am: Adjust.
* src/tgba/bdddict.cc: Adjust include.
* src/tgbaalgos/ltl2tgba_fm.cc: Remove useless include.

src/priv/bddalloc.hh

@@ -0,0 +1,58 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2013 Laboratoire de Recherche et Développement
+// de l'Epita (LRDE).
+// Copyright (C) 2003, 2004  Laboratoire d'Informatique de Paris 6 (LIP6),
+// département Systèmes Répartis Coopératifs (SRC), Université Pierre
+// et Marie Curie.
+//
+// This file is part of Spot, a model checking library.
+//
+// Spot is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (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 MERCHANTABILITY
+// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+// 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/>.
+
+#ifndef SPOT_PRIV_BDDALLOC_HH
+# define SPOT_PRIV_BDDALLOC_HH
+
+#include "freelist.hh"
+#include <list>
+#include <utility>
+
+namespace spot
+{
+  /// \ingroup misc_tools
+  /// \brief Manage ranges of variables.
+  class bdd_allocator: private free_list
+  {
+  public:
+    /// Default constructor.
+    bdd_allocator();
+    /// Initialize the BDD library.
+    static void initialize();
+    /// Allocate \a n BDD variables.
+    int allocate_variables(int n);
+    /// Release \a n BDD variables starting at \a base.
+    void release_variables(int base, int n);
+
+    using free_list::dump_free_list;
+  protected:
+    static bool initialized; ///< Whether the BDD library has been initialized.
+    int lvarnum; ///< number of variables in use in this allocator.
+  private:
+    /// Require more variables.
+    void extvarnum(int more);
+    virtual int extend(int n);
+  };
+
+}
+
+#endif // SPOT_PRIV_BDDALLOC_HH