Training a recommender should not create a copy of the initial CAS for documents in state NEW

[reckart]

Is your feature request related to a problem? Please describe. When a document is loaded e.g. for training by a recommender, it will create a copy of the initial CAS for the given user. This can be a waste disk space and should not be necessary.

Describe the solution you'd like Just read the intial CAS and process it.