[#80996564] database admin report for missing customer access_rights based on upcoming visits

Squashed commit of the following:

commit 382e2b1ff72004d8acc23d83718ea6c0138f6b69
Author: Franco Sellitto <franco.sellitto@zhdk.ch>
Date:   Fri Oct 31 11:24:52 2014 +0100

    database admin report for missing customer access_rights based on upcoming visits
Conflict resolution.