* usr/lib/byobu/include/Makefile.am, usr/lib/byobu/include/tmux-send-
  command-to-all-panes, usr/lib/byobu/include/tmux-send-command-to-
  all-windows, usr/share/byobu/keybindings/f-keys.tmux,
  usr/share/byobu/keybindings/f-keys.tmux.disable,
  usr/share/doc/byobu/help.tmux.txt:
  - add two new keybindings for byobu-tmux, Shift-F9 and Ctrl-F9
  - these will prompt you for a command, and then run that command
    in all splits or windows (respectively)
releasing 5.73
opening 5.74