univ_open: swap between USB's home directory and actual home directory
univ_open: swap between USB's home directory and actual home directory

If we call univ_open without any arguments, and the USB drive's home
directory (/mnt/usb/h) exists, we always try to go there, but if we're
already there, we go to /home/$USER instead.

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg