Add support for reading/writing gx:balloonVisibility tags
BUG: 336420
REVIEW: 118868
cleanup includes
remove & from qreal parameters
adjust map position when item is clicked
d-pointrify PopupLayer
let item handle all update requests
move viewport adjustment out of rendering loop
tiling
debug++
use www.geonames.org rather than the deprecated ws.geonames.org server

* seems to deliver more results
add search runner