lat/lon search results can be too generic

[tyrasd]

After #509, the search tool on the website uses nominatim to get a list of real object for a lat/lon search term. Which makes sense. But, under some circumstances the results are too generic:

1. start with a zoomed out map
2. search for a set of coordinates, e.g. 52.2575, 4.786667
3. get "European Union" as the result instead of a list of features that are actually at the given location

I guess it would be safe to assume that a user doesn't want to search learge scale features if entering coordinates. I mean, one can't get any more specific than using coordinates, can one?

Another case is when there are no features at/around the searched coordinates the results may lie far from the actually searched coordinates.

1. start with a zoomed in map
2. search for 77.0, 100.0
3. the only search result is at 72.56819, 94.76948 which is about 500km away.

[tomhughes]

Urggh... That's a nasty regression. If somebody enters coordinates we really should show those exact coordinates somewhere in the result.

[tomhughes]

Fixed by merging #512.