<ticket>#562</ticket>
<ticket>#562</ticket>

When saving a vistrails as another name, the workspace will now move the old vistrail to the closed vistrails area.

gui/collection/workspace.py
   class QVistrailList
      add_vt_window()
          the item will be reused only if is has the same locator as the
          view, else it will be removed and add to the other area

      remove_vt_window()
           When removing an item, get the url from the view only if the entity
            is invalid. This will make sure we get the original locator in case
            the view was changed.

celiafish/VisTrails,VisTrails/VisTrails,minesense/VisTrails,Nikea/VisTrails,Nikea/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,celiafish/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,minesense/VisTrails,hjanime/VisTrails,celiafish/VisTrails,minesense/VisTrails,hjanime/VisTrails,minesense/VisTrails,minesense/VisTrails,hjanime/VisTrails,VisTrails/VisTrails