* usr/bin/byobu, usr/share/byobu/profiles/common: LP: #1031925
  - 'byobu-screen -t foo' was hanging
  - seems that screen's shelltitle command in our common profile
    conflicts with the -t option on the command line
  - add a hack to byobu that detects this, and avoids hanging
  - set title to . otherwise (seems we need one printable character here)