call WatcherGraph::doMaintainence() prior to write_kml() to cull expired edges and keep the KML file small
call WatcherGraph::doMaintainence() prior to write_kml() to cull expired edges and keep the KML file small

akbardotinfo/watcher-visualization,akbardotinfo/watcher-visualization,akbardotinfo/watcher-visualization,akbardotinfo/watcher-visualization,akbardotinfo/watcher-visualization