First version of admin page for weather station data sources

...ontroller/servlet/WeatherStationDataSourceController.java

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

.../no/nibio/vips/logic/entity/WeatherStationDataSource.java

...ources/no/nibio/vips/logic/i18n/vipslogictexts.properties

...ces/no/nibio/vips/logic/i18n/vipslogictexts_bs.properties

...ces/no/nibio/vips/logic/i18n/vipslogictexts_hr.properties

...ces/no/nibio/vips/logic/i18n/vipslogictexts_nb.properties

...ces/no/nibio/vips/logic/i18n/vipslogictexts_sr.properties

.../no/nibio/vips/logic/i18n/vipslogictexts_zh_CN.properties

.../webapp/formdefinitions/weatherStationDataSourceForm.json

src/main/webapp/templates/weatherStationDataSourceForm.ftl

src/main/webapp/templates/weatherStationDataSourceList.ftl