A 3d element that can be used as an interface between a square face and two triangles (nonconforming faces)
Yamakawa hex recombination: fixes + adding trihedra interface elements

there's no need to impose unique client names on the server: it just complicates everything - so let's remove this limitation

- can loop over Print.Parameter and provide script using that parameter
- can preview animation

removed clscale & perspective buttons from status bar

allow multiple view selection in option window + changed "link" logic to make it much easier to modify options for several views at once

than native here (for a large number of strings))

A new implementation for gamepad. option "-gamepad" is needed now. If no option, gamepad can be seen but nothing happens. 
All functionalities with "-gamepad", even if no gamepad is plugged when gmsh is launched. 
Gamepad can be plugged or desactivated during execution.