Re-add file for example plane_graph_to_lcc_2.cpp which has strangely disappeared.

.gitattributes

@@ -2027,6 +2027,7 @@ Linear_cell_complex/examples/Linear_cell_complex/CMakeLCCViewerQt.inc -text
 Linear_cell_complex/examples/Linear_cell_complex/CMakeLCCViewerVtk.inc -text
 Linear_cell_complex/examples/Linear_cell_complex/CMakeLists.txt -text
 Linear_cell_complex/examples/Linear_cell_complex/data/graph.off -text
+Linear_cell_complex/examples/Linear_cell_complex/data/graph.txt -text
 Linear_cell_complex/examples/Linear_cell_complex/data/points_2 -text
 Linear_cell_complex/examples/Linear_cell_complex/data/points_3 -text
 Linear_cell_complex/examples/Linear_cell_complex/data/small_points_2 -text

Linear_cell_complex/examples/Linear_cell_complex/data/graph.txt

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Linear_cell_complex/examples/Linear_cell_complex/plane_graph_to_lcc_2.cpp

@@ -51,8 +51,8 @@ int main(int narg, char** argv)
   std::string filename;
   if ( narg==1 )
   {
-    filename=std::string("data/graph.off");
-    std::cout<<"No filename given: use data/graph.off by default."<<std::endl;
+    filename=std::string("data/graph.txt");
+    std::cout<<"No filename given: use data/graph.txt by default."<<std::endl;
   }
   else
     filename=std::string(argv[1]);