[registrars] Using IANA IDs

Hi all, I propose that the registries implement the following change: Instead of using proprietory registrar ids, standardized ids shall be used both on protocol level (rrp/epp/reports etc.) and in the whois output. The effect would be that for example CORE is IANA-15 in all registry communication and not R135-LRMS at Afilias, R23-LROR at PIR and so on. Especially transfers would become simpler, e.g. registrants will be less confused who they want to transfer their domain to, Yours, Marcus