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"

python interface: all std::vector<> in element constructors are declared as const, allows easy python binding

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

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