the same

Add gamepad use to navigate into the model. Compiles on MS-Windows but still not works (to be done).

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)

- fixed MED node ordering
- polished 64 bit Cocoa Mac OS X FLTK version
- updated copyright

Camera mode is avaiable with camera aperture tuning
stereo is available on stereo device only, otherwise the program
makes a segmentation fault with a openGL message :

"Insufficient GL support
 new gl windows for stereovision0x9477658
 Erreur de segmentation"

not work yet. Commented lines have been commit for CYAN/RED stereo but
this kind of stereo mode is not convincing.

utils/api_demos/mainGlut  :

- introduction of a class Camera to use function glulookat() instead of
rotation matrix in openGL viewport.

- A special implementation of the Trackball for stereo mode to be
consistent with other code (Abaqus, Catia, ...)

- adaptation of Drawcontext in Camera mode (works for mainGlut but to
  be validated in gmsh