* debian/rules, usr/bin/byobu.in, usr/bin/byobu-launcher.in, usr/bin/ctail, usr/lib/byobu/include/select-session.py: - silence some checkbashisms false positives - handle nesting a bit differently - allow nesting, by default - detect the infinite loop situation, where we're ssh'ing into ourselves, and handle it gracefully - ensure we have access to 256 colors, even when nesting