delete the class MultiValuedMap after we have the new kernel
Delete the class org.fortiss.af3.component.generator.nusmv.MultiValuedMa It is a minimal implementation for multi valued map, but this should be deleted once we have the new kernel and the code should refer to the multi valued map from apache collections.
(from redmine: issue id 2705, created on 2016-10-10, closed on 2018-01-19)