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

[Ryszard Mikke]

When I get a link to changeset, all I see on the map is a rectangle containing all the changes. [Like this](https://www.openstreetmap.org/changeset/38125857).
![Current changeset view](https://cdn.blabler.pl/image/1Lrj/dash)

Why don't we use Achavi changeset view? [It shows much more](http://nrenner.github.io/achavi/?changeset=38125857).
![Achavi changeset view](https://cdn.blabler.pl/image/1Lrk/dash)

If Achavi is considered not stable enough to replace the current view, there should be at least a link to Achavi at the end of the change list:
![Placement of link](https://cdn.blabler.pl/image/1Lrm/dash)

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