Remove the menu entry for copying the configruation

Issue #188 (closed)

Here I remove the entry for copying the configuration. I did that as I have the feeling that the configuration relies to strong on the actions concept to be copied in a meaningful way. We could only copy the basic data (which will change anyway) and the contacts. Locations and mounts can't be copied as those are specific for "real" devices (that can't be on multiple places in the very same time). And those actions also represent the history - which we will not have there for a new configuration.