[openstreetmap-website] Allow reporting of abusive users to moderators or admins (#841)

[Tom Hughes]

Well the table will need to reference the reported objects. I envisage a `user_reports` tables with columns along the lines of:

```
id
user_id
object_type
object_id
reporter_id
```

Where `user_id` is the ID of the reported user, `object _type` and `object_id` form a polymorphic reference to the reported object (eg `DiaryEntry` and `23` or `DiaryComment` and `456`) and `reporter_id` is the ID of the user making a report.

There would need to be an index on `user_id` so we could find all reports for a user, and a unique index on `reporter_id+object_type+object_id` to make sure users can't report the same object twice.

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https://github.com/openstreetmap/openstreetmap-website/issues/841#issuecomment-63872474
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