remove old 2d lib

dune/alugrid/src/alugrid_2d.cc

-#ifndef __ALUGRID_2D_CC_INCLUDED__
-#define __ALUGRID_2D_CC_INCLUDED__
-
-#define ALU2DGRID_COMPATIBILITY_LEVEL 2
-#include "alugrid_2d.h"
-
-#ifndef NDEBUG
-#warning -- Compiling ALUGrid code in debug mode!!! Use -DNDEBUG to get more optimized code!!!
-#endif
-
-namespace ALU2DGrid
-{
-
-// this is needed since the code does not used std :: 
-using namespace std; 
-
-#include "2d/grid.cc"
-#include "2d/triang.cc"
-#include "2d/hdlrw.cc"
-#include "2d/mknbrs.cc"
-#include "2d/handle.cc"
-#include "2d/vmmap.cc"
-#include "2d/vtx_btree.cc"
-
-} //end namespace 
-
-#endif