Domains page sort on occurrences

Allow the Domain Tracking page, https://metasmoke.erwaysoftware.com/domains, to be sorted based on amount of Occurrences.

At the moment it seems sorting can be done using queries ([example](https://metasmoke.erwaysoftware.com/data/sql/queries/16-hits-per-domain)), but those do not have the other capabilities of the Domain Tracking page.