Blender Git Loki

Multiview: Quadbuffer (time sequential) working [debug builds only]

I'll enable this mode in Release builds once I figure out how to best
handle opening files that are saved with the quadbuffer mode.

In fact I think no display mode should be saved/read from a file.

Tested in Linux with NVidia 3D Vision and NVidia 3D Vision Pro with
NVidia Quadro FX 580 and Quadro FX 4600.

(kudos for the Visgraf Lab at IMPA, for having me around with all those
gadgets ;)

Thanks for Cédric Paille (cedricp) for the code snippets and tests -
T44327