Send the style information of POINT geometries to the print service

Print correctly the external icons.

http://mf-geoadmin30t.bgdi.admin.ch/ltteo/prod/?lang=fr&topic=ech&X=158795.00&Y=510578.77&zoom=4&bgLayer=ch.swisstopo.pixelkarte-grau&layers=KML%7C%7Chttp:%2F%2Fwww.meteosuisse.admin.ch%2Fweb%2Ffr%2Fclimat%2Freseaux_de_mesures%2Fsurface%2Fgoogle_earth.Par.0006.DownloadFile.ext.tmp%2Fswissmetnet.kml,KML%7C%7Chttp:%2F%2Fopendata.utou.ch%2Furbanproto%2Fgeneva%2Fgeo%2Fkml%2FRoutes.kml