Aliasing rum-locker -> pockyrumz.

Reason: rum-locker (http://www.furaffinity.net/user/rum-locker/) is pockyrumz's (http://www.furaffinity.net/user/pockyrumz/) secondary and personal account, where he sometimes posts sketches. Although I've changed all current "rum-locker" tags to "pockyrumz", it might be useful for future uploads to avoid scattered posts from the same artist.