LL-379
* deprecated service call searchCombined and replaced it by search
* using SSEntity as search result now after its extension with circleTypes and entries properties
* using SSEntity as super class for SSColl and SSDisc to have circleTypes and entries also represented for possible other entity types and search results of course
* adding circle types of found entities to search results and returning entries for discs/qas/chats on demand for service op search