bootserver: add script for listing images and their various "states"

The name of the script is prefixed with underscore to denote that its
currently experimental, it should not be trusted and the format of the
output can change.
client: use zram in laptops and fatclients
client: nvidia package has been renamed: nvidia-current => nvidia-304
client: configure pulseaudio default-{sink,source} from Puavo
Merge branch 'thinguest.v2' into tjjr