Removed itkCloneMacro because it was never correctly implemented.
Replaced the usage of DataNode:Clone with New()/CreatAnother()
Because this is what currently realy happened.
Signed-off-by: Ralf Floca <firstname.lastname@example.org>
Test Plan: Code Review and unit test
Reviewers: O1 MITK Reviewer Group I, kislinsk
Reviewed By: O1 MITK Reviewer Group I, kislinsk
Differential Revision: https://phabricator.mitk.org/D303