FIX for creating and processing derived transformations

At the creation of the new transformation (unfortunately still in TransformationDB), set NotProcessed the files that were Unused in the parent transformation. This will allow any mistake resetting the transformation Active to create disasters…
For recovering files from the parent that change status after the derivation, set files Unused in the parent to NotProcessed in the derivation.
Do all changes of status in bulks rather than file by file...
Add information to messages about the current transformation.