Add Scripts/TCOS.nvidia_install - script to build different nvidia drivers.
Changed lightdm background in etc/lightdm/lightdm-gtk-greeter.conf
Merge branch 'master' of github.com:openthinclient/openthinclient-os-core
Some last changes to get base 2.0-22 ready to build.
This commits all remaining stuff for bases 2.0-22 up to 2.0-25 .

- have fglrx
- have nvidia
- fix timing for tcos-xrandr in lightdm.conf