Makes it possible to average over multiple buildstats. If --multi is
specified (and the given path is a directory) the script will read all
buildstats from the given directory and use averaged values calculated
from them.
All of the buildstats must be from a "similar" build, meaning that no
differences in package versions or tasks are allowed. Otherwise, the
script will exit with an error.
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
