Fix the MhexahedronN::getFaceVertices() that now returns the nodes of the face...

Fix the MhexahedronN::getFaceVertices() that now returns the nodes of the face (oriented such a way that an MQuadrangleN can be defined from these vertices) 

Fix a typo reported by Martin Hautefeuille 

Geo/MHexahedron.h

@@ -499,20 +499,38 @@ class MHexahedronN : public MHexahedron {
   {
     v.resize((_order+1)*(_order+1));
     MHexahedron::_getFaceVertices(num, v);
+//    static const int f[6][4] = {
+//      {0, 3, 2, 1},
+//      {0, 1, 5, 4},
+//      {0, 4, 7, 3},
+//      {1, 2, 6, 5},
+//      {2, 3, 7, 6},
+//      {4, 5, 6, 7}
+//    };
+    // this is the local edge number indexed from 1. A minus sign is used to indicate that the nodes of the edge must be inverted in order to obtain a MQuandrangleN
     static const int f[6][4] = {
-      {0, 3, 2, 1},
-      {0, 1, 5, 4},
-      {0, 4, 7, 3},
-      {1, 2, 6, 5},
-      {2, 3, 7, 6},
-      {4, 5, 6, 7}
+      {2,-6,-4,-1},
+      {1,5,-9,-3},
+      {3,10,-8,-2},
+      {4,7,-11,-5},
+      {6,8,-12,-7},
+      {9,11,12,-10}
     };
     int count = 4;
     for (int i = 0; i < 4; i++){
-      for (int j = 0; j < _order - 1; j++) v[count++] = _vs[(_order-1)*f[num][i]+j];
+      if(f[num][i]>0)
+      {
+        int edge_num = f[num][i]-1;      
+        for (int j = 0; j < _order - 1; j++) v[count++] = _vs[(_order-1)*edge_num+j];
+      }
+      else
+      {
+        int edge_num = -f[num][i]-1;
+        for (int j = _order-2; j > - 1; j--) v[count++] = _vs[(_order-1)*edge_num+j];
+      }
     }
     int N = _order - 1;
-    int start = 8 + 12 * N + num * (_order - 1) * (_order - 1);
+    int start = 12 * N + num * (_order - 1) * (_order - 1);// -8 as _vs has not the 8 first order nodes
     for (int i = 0; i < (_order - 1) * (_order - 1); i++){
       v[count++] = _vs[start + i];
     }

contrib/Netgen/libsrc/occ/occgeom.cpp

@@ -574,7 +574,7 @@ namespace netgen
       cout << "Edges           : " << nnre << " (" << nre << ")" << endl;
       cout << "Vertices        : " << nnrv << " (" << nrv << ")" << endl;
       cout << endl;
-      cout << "Totol surface area : " << newsurfacecont << " (" << surfacecont << ")" << endl;
+      cout << "Total surface area : " << newsurfacecont << " (" << surfacecont << ")" << endl;
       cout << endl;
    }