Fix huge memory link in Collection iterator.

* Bug: In Hurricane::Collection::iterator, the iterator use a locator from
    a getLocator() not wrapped inside an auto_pointer like GenericLocator.
    So the destructor of the iterator must take care of the deletion.
      This was showing more and more as we converted forEach() into the
    C++ 11 for syntax.
      Seems to decrease the memory use by almost a factor 2...
* Bug: In Dijkstra::_cleanup(), as a double security, cleanup the queue.

anabatic/src/Dijkstra.cpp

@@ -1779,6 +1779,7 @@ namespace Anabatic {
   //_checkEdges();
     _sources.clear();
     _targets.clear();
+    _queue.clear();
     _searchArea.makeEmpty();
     _connectedsId = 0;
   }

hurricane/src/hurricane/hurricane/Collection.h

@@ -206,6 +206,7 @@ template<class Type> class Collection {
     class iterator {
       public:
                   iterator   ( Locator<Type>* l )        : _locator(l) {} 
+                 ~iterator   ()                          { delete _locator; }
         bool      operator== ( const iterator& o) const  { return not (*this != o); }
         iterator& operator++ ()                          { _locator->progress(); return *this; }
         Type      operator*  ()                          { return _locator->getElement(); }