Create an optional link between choreographers and users

[dcmorse]

Since our users might be The Actual Fancypants Choreographers, there should be a way to link the accounts. Has_one/Belongs_to? Or allow pseudonyms?

[cranhandler]

New request for this for user 97.

While we're chronicling:
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34/122

Also useful in this request: choreographer allowed to edit own choreographer page (with website, permissions), and an "authoritative" tag on their own entry of their own dance.