Add selection of grid weather datasource to organization form

...vips/logic/controller/servlet/OrganizationController.java

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

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

...rces/db/migration/V20__Add_Datasource_Property_IsGrid.sql

...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

src/main/webapp/formdefinitions/organizationForm.json

src/main/webapp/templates/organizationForm.ftl