remove outdated comment
[API change] remove PopupLayer::setPlacemark()

This method contains special code for "builtin" placemarks such as satellites and cities, while it shows rather generic content for "unknown" ones.
In other words, this convenience method is not really helpful for use in public API.
Therefore, move its code to a less visible place.
tiling
debug++
use www.geonames.org rather than the deprecated ws.geonames.org server

* seems to deliver more results
add search runner