Added deeper integration by saving at SaveMode content of user dir
completely to a user/SafeMode dir, including the whole stack
of pack files. Repair happens in that safe directory, so that
the user dir is resetted to default when re-started in SafeMode.
All changes (including complete deletion) are played back to
the user config at first restart with disabled SafeMode

Change-Id: I5114c7d5d04582be62090707bc9b97afa55fc1f1
Reviewed-on: https://gerrit.libreoffice.org/30003Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Armin Le Grand <Armin.Le.Grand@cib.de>