Merge branch 'feature/time-series-in-vipsweb' into develop

.../nibio/vips/logic/controller/session/ObservationBean.java

...s/logic/controller/session/ObservationTimeSeriesBean.java

src/main/java/no/nibio/vips/logic/entity/Observation.java

...ava/no/nibio/vips/logic/entity/ObservationTimeSeries.java

.../no/nibio/vips/logic/entity/rest/ObservationListItem.java

.../java/no/nibio/vips/logic/service/ObservationService.java

...ibio/vips/logic/service/ObservationTimeSeriesService.java