Add functionality to force MultiIndexedContainer to contain unique entries
In the data, sometimes two clusters with the same ChannelID are provided. This MR adds the option to explicitly remove these from the container.
Goes together with Rec MR Rec!3985 (merged) Moore!3606 (merged)
*this builds on the MR that adds sorting - so first merge !4595 (merged) *
Edited by Miroslav Saur