OCCI Configuration designer deletes extension elements along with config elements

[wpiers]

Due to the fact that the default delete tool of Sirius deletes what is displayed by the mapping.
To fix that we must define a custom delete.

[wpiers]

c9f8605

[wpiers]

To fix this issue on any other similar case:

add a simple delete service:
public void deleteElement(EObject eo) {
EcoreUtil.delete(eo);
}

in the .odesign, declare 2 delete tools:

Then apply the tools to the appropriate mapping. If the type is extensionRelated => no delete, delete otherwise.