Task #9607: changed postgres notification mechanism. Do not return full row as json anymore, because the payload is not allowed to be larger than 8000 chars. Now, just return on value as payload, usually the id, and handle the rest in the PostgresListener subclass

Task #9607: only guess start/end time for CEP4 pipelines, use duration from parset if given else 1hour

Task #9607: available_capacity for cep4storage resource is updated regurarly by datamanagement service, so no need anymore to call ssdb

Task #9351: merged branch Webscheduler-Task9349 (c34667) via trunk into this branch because I need the angular contextmenu which was developed there

Task #8887: resourceassigner publishes scheduled/conflict events on bus. rotspservice reacts to these events via rabuslistener instead of radbbuslistener