Use modern prefetch.

This removes the yepnope library, instead using <link rel="prefetch">
with a polyfill (the polyfill will work on Safari but reload cached
script on the front page each time).

We prefetch map-related JavaScript (and other libraries only used on map
pages, such as Dropzone and Fancybox) on non-map pages, and don't bother
loading the validate plugin on the front page.

Now the map JavaScript list is available everywhere, we can use that
in the prefetch rather a hardcoded list.

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