-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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if argc/argv is not provided, don't load option files (this is what is usually expected when using Gmsh as a lib)