georef: remove useless rtree
georef: add find_admins and use it
georef: move GeoRef::build_admins_{stop_points,pois} into Data::build_administrative_regions
cities: add sane default for alembic.ini
ed: add support of the cities database in ed2nav to add admins to sp, sa and poi
type: remove GeographicalCoord::is_default_coord
kraken: remove warning on deprecated gperftools header
Merge pull request #556 from TeXitoi/add-admin-to-sp

ed: Add admin to stop points and poi using cities