[FEM] FemMesh*: remove unused includes

- also sort includes

src/Mod/Fem/App/FemMeshPyImp.cpp

@@ -20,39 +20,32 @@
  *                                                                         *
  ***************************************************************************/
 
-
 #include "PreCompiled.h"
 
 #ifndef _PreComp_
 # include <algorithm>
 # include <stdexcept>
 # include <Python.h>
-# include <SMESH_Gen.hxx>
 # include <SMESH_Group.hxx>
 # include <SMESH_Mesh.hxx>
 # include <SMESHDS_Group.hxx>
 # include <SMDSAbs_ElementType.hxx>
 # include <SMDS_MeshElement.hxx>
-# include <SMDS_VolumeTool.hxx>
 # include <SMESHDS_Mesh.hxx>
-
-# include <TopoDS_Shape.hxx>
-# include <TopoDS_Face.hxx>
 # include <TopoDS.hxx>
+# include <TopoDS_Face.hxx>
+# include <TopoDS_Shape.hxx>
 #endif
 
-#include <Base/VectorPy.h>
-#include <Base/MatrixPy.h>
 #include <Base/PlacementPy.h>
 #include <Base/QuantityPy.h>
-
-#include <Mod/Part/App/TopoShapePy.h>
-#include <Mod/Part/App/TopoShapeSolidPy.h>
-#include <Mod/Part/App/TopoShapeFacePy.h>
-#include <Mod/Part/App/TopoShapeEdgePy.h>
-#include <Mod/Part/App/TopoShapeVertexPy.h>
+#include <Base/VectorPy.h>
 #include <Mod/Part/App/TopoShape.h>
-
+#include <Mod/Part/App/TopoShapePy.h>
+#include <Mod/Part/App/TopoShapeEdgePy.h>
+#include <Mod/Part/App/TopoShapeFacePy.h>
+#include <Mod/Part/App/TopoShapeSolidPy.h>
+#include <Mod/Part/App/TopoShapeVertexPy.h>
 #include "Mod/Fem/App/FemMesh.h"
 
 // inclusion of the generated files (generated out of FemMeshPy.xml)
@@ -60,6 +53,7 @@
 #include "FemMeshPy.cpp"
 #include "HypothesisPy.h"
 
+
 using namespace Fem;
 
 // returns a string which represents the object e.g. when printed in python