Fix: return only public weatherstations unless stated otherwise

...ontroller/servlet/NotificationSubscriptionController.java

...s/logic/controller/servlet/PointOfInterestController.java

...io/vips/logic/controller/session/PointOfInterestBean.java

...asks/RunAllForecastConfigurationsForOrganizationTask.java

src/main/java/no/nibio/vips/logic/service/LogicService.java

src/main/java/no/nibio/vips/logic/service/POIService.java