[openstreetmap/openstreetmap-website] Change the way changesets are displayed to use achavi (#1376)

[mmd]

> The Achavi is not scalable. Now it queries a changeset for a minute or so. If we are to direct hundreds of mappers to it, overpass api might choke.

I have put up a demo achavi services, which queries a dev Overpass instance with performance improvements not yet available on the main instance.

http://dev.overpass-api.de/tmp/psv/achavi/index.html?changeset=38125857

Please adjust the changeset number as needed.

I'd be very interested to get some feedback on response times. Note: db is running on hard disks... 

Also, did you talk to Roland already regarding this? @drolbr 


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