Release 7.4.1: Add version argument to FileStorageFileAccess#copy method

[Guest]

The method with the signature

IDTuple copy(IDTuple source, String destFolder, File update, InputStream newFile, List<File.Field> modifiedFields) throws OXException;

currently lacks the possibility to specify the source version to copy the data from. Therefore, a version parameter is introduced there, so that the new signature will look like:

IDTuple copy(IDTuple source, String version, String destFolder, File update, InputStream newFile, List<File.Field> modifiedFields) throws OXException;