Review MIRW: Add RTR, RTA, PPR, PPA to 3gpp dict

Matt, please can you have a quick look at my freeDiameter definitions for RTR, RTA, PPR and PPA? I've screwed up the indentations again but I can't be bothered to sort that out right now, and I'm not even sure what it's supposed to look like. Blah. The real changes I've made are just adding the last 4 commands.