Support packages snapshot

Include the snapshop of the packages system installation
state. This is simply a generated md5 hash of all the
packages installed in the laptop.

This is a request from the support crew.

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

Add new sql migration file and update changes log.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Release 0.4.1-1

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