Upgrading version to 1.1.1-dev
delete fifos on_exit unless --keep-fifos argument has been given
use trap to send a cancel-command to control_mode when xmpp --next-msg is interrupted.
Upgrading version to 1.2.0 (delete fifos on exit; cancel --next-msg if calling xmpp is killed)
Merge tag 'v1.2.0'

delete fifos on exit; cancel --next-msg if calling xmpp is killed