Repaired LookupItemSetService against validation schema
optional informations migrated to holdings set, which means hold queue, circ status & item description ->
fully implemented item desription: added item description level, call number, copy number & number of pieces

particular problems while lookingup set of items migrated to each one seperately - choice of turning on/off this function is still enabled (toolkit.properties)

fixed problem reporting in general - now it forwards problems to each bibliographic information seperately instead of disabling everything & just sending responseData with some problem

added some error messages (if there was not set a value for something (e.g. Copy number)

Edited Alephitem so that it stores data in specific format (it was all String) - now it is more likely parseable directly to response data

ehm & drinked about liter of coffee :D