New methods for addDestination and addDestinationsDefinedByHostsOnFacility


- method addDestination for list of Services
- method addDestinationsDefinedByHostsOnFacility for listOfServices
- method addDestinationsDefinedByHostsOnFacility for only already assigned services on facility
- helping private method addDestinationEvenIfAlreadyExists which do not throw exception if destination already exists, only return this destination.
- basic tests for all three methods