Usernames are now space-insensitive

[Dani]

Probably pretty late to the party, but you now cannot register a new username that is the same as an existing one other than spaces. For example, if someone already has the username 'Reverend Jim', you cannot register 'ReverendJim'. Previously, only exact match usernames were checked. However, to avoid confusion, I think this makes much more sense. It just took a little bit of work to check for. I had to add another column in the database that stored/indexed the non-spaced version of a username, because checking on-the-fly using MySQL's REPLACE() was not performant enough for realtime checks.