Change account deletion functionality to allow account anonymisation and prevent deletion of IDs

[thebeachcomber]

@spiphany

All content would have to either be attributed to a single account for all deleted users or each item would have to be independently assigned to a random anonymous user ID.

This proposal is suggesting the first of these scenarios, correct?

That’s a good distinction that I neglected to think about. I am open to either, whichever people think is more appropriate