+ Bug fix for periodic boundary 4 - now the boundary is properly applied on geometry when is defined as a separate thread in thread_params.cfg file.
+ Added a new parameter for the periodic boundary that is set in thread_params.cfg: LinkedPeriodicBoundaryShift. The LinkedPeriodicBoundaryShift defines the offset of the linked surface for the periodic condition. If [0,0,0] or not specified - automatic linking is applied.
+ Added a new parameter for periodic boundary: AddNNonEdges. It is also set in thread_params.cfg file and causes the addition of bounce-back nodes (default for NN) on edges and corners of periodic boundary 4 defined as uid-Thread. If not specified: default value = "false".
+ New case examples for periodic boundaries: Serpentine_periodic, Hexagon_periodic, Circular_periodic and for pressure boundary: Hexagon_pressure.