Don't reload all the overlays if the resolution don't change
Don't reload all the overlays if the resolution don't change

Actually each time we change the base layer all the overlays will
be reloaded ...

owenmead/openlayers,avinet/openlayers,elbakai/openlayers,sanak/ol2,elbakai/openlayers,colllin/openlayers,wet-boew/openlayers,adh1365/openlayers,avinet/openlayers,adh1365/openlayers,sbrunner/openlayers,adh1365/openlayers,pvalsecc/openlayers,altamiracorp/openlayers,kartverket/openlayers,PublicStuff/openlayers,wet-boew/openlayers,shevawen/openlayers,Gnafu/openlayers,PetrDlouhy/openlayers,altamiracorp/openlayers,georchestra/openlayers,altamiracorp/openlayers,Gnafu/openlayers,pgiraud/openlayers,kartverket/openlayers,owenmead/openlayers,v5analytics/openlayers,openlayers/ol2,dracic/openlayers,dracic/openlayers,shevawen/openlayers,v5analytics/openlayers,PetrDlouhy/openlayers,georchestra/openlayers,Gnafu/openlayers,pgiraud/openlayers,owenmead/openlayers,ahocevar/ol2,PetrDlouhy/openlayers,altamiracorp/openlayers,colllin/openlayers,kartverket/openlayers,PublicStuff/openlayers,sbrunner/openlayers,PetrDlouhy/openlayers,dracic/openlayers,shevawen/openlayers,georchestra/openlayers,wet-boew/openlayers,openlayers/ol2,v5analytics/openlayers,colllin/openlayers,sanak/ol2,sanak/ol2,wet-boew/openlayers,sbrunner/openlayers,avinet/openlayers,sbrunner/openlayers,avinet/openlayers,v5analytics/openlayers,Gnafu/openlayers,pvalsecc/openlayers,openlayers/ol2,PublicStuff/openlayers,ahocevar/ol2,colllin/openlayers,adh1365/openlayers,pvalsecc/openlayers,ahocevar/ol2,sanak/ol2,dracic/openlayers,PublicStuff/openlayers,pvalsecc/openlayers,shevawen/openlayers,elbakai/openlayers,pgiraud/openlayers,pgiraud/openlayers,owenmead/openlayers,kartverket/openlayers,openlayers/ol2,elbakai/openlayers