Add a query-parameter to incident list to filter on an existing Filter

[hmpf]

notificationprofile.Filter's primary key could be sent in via GET-parameter.

[lunkwill42]

Security consideration here: If submitting a PK to a filter that does not belong to the current user, that should be an error

[hmpf]

See also Uninett/Argus-frontend#173

[hmpf]

The more I think about this, the better an idea it is. Querystrings are bookmarkable, so we don't need to store it on the user or set a cookie!

[hmpf]

Adding the param itself is not hard, hooking it up to the list is harder. I think it is all methods on either Filter or NotificationFilter.

[katsel]

This change is not urgently needed in the frontend, because frontend does filtering on its own. So this is nice to have / low-priority.