Add a --status-filter option to "osc results" that can be used to
show, for instance, only the repos where a package failed to build. As
a short circuit, a -f/--failed option is added, too.
Add a --brief option to "osc prjresults" and "osc results" that can be
used to get a more compact representation of the results. In case of
"osc results", --brief is ignored if the results for a package are
requested.