Topic/migrator user management

@RickMohr Ehh, yes and no. For PhillyTreeMap, there are like 20 of these users, so I was planning on sending manual emails and having a template pre-filled with their new info would be a helpful timesav if I have to modify it slightly. If an OTM1 instance ever had 200 of these users, a mail merge would make more sense, but I expect duplicate user accounts are probably a relative rarity.