* Previously, when enabling collections, a check whether a collection was enabled was performed. However, independently of the result the collection was always enabled. Consequently, if a single collection had been stated multiple times in the command line, it would be enabled multiple times. In the case of some destructive enable scriptlets, this might have led to some undetermined behavior. This update runs the enable scriptlet only if the collection has not been enabled before, and attempts to enable a collection multiple times in one environment will be ignored.