TODO : avoid topological unconsistencies for (e.g.) cones when
delaunay meshing is involved.

removed clscale & perspective buttons from status bar

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this amkes it easier to ship bundles (e.g. gmsh+getdp)

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.

Removed the -q option in initial mesh generation (generates meshes that do not respect size field)

new "-open" and "-merge" command line args to select how to open/merge the files on the command line

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   -camera               Use camera mode view
   -stereo               OpenGL quad-buffered stereo rendering

Major work on GUI : removed much-hated "menu window" & merged onelab tree in graphic window. Gmsh now requires FLTK 1.3.

(Additional changes: fixed crash when de-minimizing opengl window on mac os ; refactored Msg::StatusBar)

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