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
client: let fatclients mount /tmp from local disk

Normally, the usage of /tmp is quite low, but it might experience
temporal usage spikes, which might cause troubles for low-mem fatclients
because their /tmp is attached to tmpfs. Mounting /tmp to local disk
helps in these situations.