Add compositor constraints to ensure that at most one ExecutionUnit or TransmissionUnit is linked to a single Transceiver
The utility methods mentioned in the title (to be found in PlatformArchitectureUtils) only return the first connected element that is found. This does not suit the general case where more than one ExecutionUnit can be connected to a TransmissionUnit (and vice versa).
Instead a list of all connected elements sould be returned. The user of such a method can then still decide to use only the first element.
(from redmine: issue id 2673, created on 2016-08-10)