copy instance values in data views to clipboard (compare only)

refs #643

Change-Id: Ic0a5a0c14907e9ad83de6b21e0b85ac5fe15a88c
Reviewed-on: http://gerrit.esdi-community.eu/3143
Tested-by: Jenkins <sitemple@igd.fraunhofer.de>
Reviewed-by: Simon Templer <simon.templer@igd.fraunhofer.de>