* Use one ioctl() (CONS_SET, analogous to CONS_GET) for switching video

* Use one ioctl() (CONS_SET, analogous to CONS_GET) for switching video
  modes instead of having one ioctl() per video mode.

* Adjust userspace (vidcontrol, libvgl) accordingly.

* Bump libvgl's version number, since this makes the VGLInit() function
  incompatible (previously it took an ioctl request as the first argument,
  now it's a mode number).

* Remove scvesactl.c, which no longer serves any purpose.