Switch jobs over to use a bufferevent.
Add a flag for jobs that shouldn't be freed after they've died and use it for status jobs, then only kill those jobs when status-left, status-right or set-titles-string is changed. Fixes problems with changing options from inside #().
Remove a debugging leftover and add copyright.
Switch run-shell over to queue the command in the background like #().
run-shell command to run a shell command without opening a window, sending stdout to output mode.
