Collect counters

If harvest-monitor package is installed, then use its log
and harvest its data counters for the period of time that
concerns to this report.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Increase data format version

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Update packaging changelog

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Release 0.4.0-1

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>