Reversegeocoding for location search

Please merge https://github.com/geoadmin/service-sphinxsearch/pull/132

Don't forget that one has to update the indices in prod for the next deploy.
https://github.com/geoadmin/mf-chsdi3/issues/844
Current situation (before this PR) is not as in this PR. Before, layerBodId was _not_ present for 'parcel' and 'sn25'. With this PR, there would be layerBodId with empty string.

I agree to remove layerBodId and featurId for 'parcel' and 'sn25'.