Revert "Fixed ERRAI-474: Allow the addition of primitive attributes to entities that have been persisted"

This reverts commit 6179edf6ebf65a0cf1a947652ce2d6f19d70cb00.
Revert "Fixed ERRAI-473: JPA2 method-accessed attributes don't work"

This reverts commit 77eba66093c0d8c5e8360f8c582fdf5459dbc79a.