Lots of new functinality and bugfixes

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

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

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

...a/no/nibio/vips/logic/entity/PointOfInterestTypeFarm.java

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

...bio/vips/logic/entity/helpers/PointOfInterestFactory.java

...g/model/preprocessor/BremiaLactucaeModelPreprocessor.java

...eduling/model/preprocessor/DOWNCASTModelPreprocessor.java

src/main/resources/db/migration/V6__POI_types_added.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

src/main/webapp/templates/poiForm.ftl