IDL4CPP11 — Mapping to std::shared_ptr allows to much

In the context of CORBA it is not legal to just compare object references with operator==/!= which are both provided by std:;shared_ptr. The fact that the local client proxy is different doesn't mean the called CORBA servant is different, in IDL to C+11 comparing two interfaces is illegal (see 6.7.2 of IDL to C+11). This specification should make it clear that omg::types::ref_type<T> should not be comparable