jslock: Set jabber to away, lock, reset on return
jslock: Auto-cleanup

If there are some dead pipes with no one reading from them, we get
"dangling" processes. Wait a bit, then kill all "echo" forks.
jslock: Don't try to kill anything if there is nothing to kill
dmenu_bg: Set a wallpaper, e.g. from sxiv
dmenu_bg: Generate infos for bgsetter2 and screeninfo