message: Documentation: added link to OrientedPointMatrix where edge_flags are commented.
diff: @@ -180,7 +180,7 @@ public:
  {
  int master; ///< master number (in Mesh numbering)
  unsigned matrix : 24; ///< index into NCList::point_matrices[geom]
  - unsigned edge_flags : 8; ///< edge orientation flags
  + unsigned edge_flags : 8; ///< orientation flags, see OrientedPointMatrix
  Slave() = default;
  Slave(int index, int element, int local, int geom)
  