KDM — Remove prototype unit

Remove prototype unit, since it is not an independent model element, but either a signature or callable unit or a storable unit with external is true. If later it is substituted with a real definition, the calls or reads/writes relations will go to the internal definition, and UsesPrototype relationship will go to the external one. The internal definition is related to the external one by PrototypedBy relationship. Usually the external definition lives in a SahredUnit. This should be clarified in the spec. Note, there exists an issue about example ralated to this.

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