Removed obsolete and unused include in Alpha_shapes_2, see bb086ff

The fact that power_side_of_bounded_power_circle_2 was not in the kernel
and this include was not used means that weighted alpha shapes 2 are bugged
(they ignore weights and only call side_of_bounded_sphere()). This will be
fixed when implicit conversions are removed.

Alpha_shapes_2/include/CGAL/predicates/in_smallest_orthogonalcircle_ftC2.h

@@ -1,56 +0,0 @@
-// Copyright (c) 1997  INRIA Sophia-Antipolis (France).
-// All rights reserved.
-//
-// This file is part of CGAL (www.cgal.org).
-// 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.
-//
-// Licensees holding a valid commercial license may use this file in
-// accordance with the commercial license agreement provided with the software.
-//
-// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
-// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
-//
-// $URL$
-// $Id$
-// 
-//
-// Author(s)     : Tran Kai Frank DA <Frank.Da@sophia.inria.fr>
-
-#ifndef CGAL_IN_SMALLEST_ORTHOGONALCIRCLE_FTC2_H 
-#define CGAL_IN_SMALLEST_ORTHOGONALCIRCLE_FTC2_H
-
-#include <CGAL/license/Alpha_shapes_2.h>
-
-
-#include <CGAL/determinant.h>
-#include <CGAL/enum.h>
-
-//-------------------------------------------------------------------
-namespace CGAL {
-//-------------------------------------------------------------------
-
-template< class FT >
-CGAL_MEDIUM_INLINE
-Bounded_side
-in_smallest_orthogonalcircleC2(const FT &px, const FT &py, const FT  &pw,
-			       const FT &qx, const FT &qy, const FT  &qw,  
-			       const FT &tx, const FT &ty, const FT  &tw)
-{
-  FT dpx = px-qx;
-  FT dpy = py-qy;
-  FT dtx = tx-qx;
-  FT dty = ty-qy;
-  FT dpz = CGAL_NTS square(dpx)+CGAL_NTS square(dpy);
- 
-  return Bounded_side 
-    (CGAL_NTS sign(-(CGAL_NTS square(dtx)+CGAL_NTS square(dty)-tw+qw)*dpz
-		   +(dpz-pw+qw)*(dpx*dtx+dpy*dty)));
-}
-
-//-------------------------------------------------------------------
-} //namespace CGAL
-//-------------------------------------------------------------------
-
-#endif //CGAL_IN_SMALLEST_ORTHOGONALCIRCLEC2_H