Remove vestigial routes

Namefinder support was removed in 1a0728ec7b46efdaf3cf9455f288f08ecd465d2b.
Use reverse geocoders for any lat/lon queries

This simplifies the implementation, allows code sharing with
"Where am I?", and produces friendlier results for lat/lon
searches (actual reverse geocode results rather than a raw
lat/lon display).