* usr/bin/byobu-ctrl-a.in: LP: #1274720 - cherry pick upstream r2338 - revert r2317, as this is breaking ctrl-a in byobu-screen in a bad way * usr/bin/byobu-janitor.in: LP: #1311919 - cherry pick upstream r2337 - ensure that windows.tmux exists; fixes nasty warning with F5