[bin/mb] Recognize --moz properly
[bin/mb] moz -> cmd moz
[bin/mb] Fix syntax error
[bin/lib/util.sh] Just use printf %q for sh_quote

The \'${derp//\'/\'\\\'\'}\' thing was a misguided attempt to get
prettier output than printf %q, which prefers\ escaping\ random\ spaces,
but doesn't quote things like literal newlines and unknown other edge
cases
[moz] Add a fixme note
[sys] Add tmpfiles.d/distcc.conf for the distcc /tmp symlink thing
[.gitignore] Ignore ./powerline