[openstreetmap-website] Let history viewer respect middle-click and Ctrl+click (#1020)

[Midgard]

You could also provide an opt-in for the 'bad' behaviour in the user settings.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1020#issuecomment-125769939
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