GeneratorObjects/McEventCollection.h, GeneratorObjects/xAODTruthParticleLink.h, cmt/requirements - switch to using AthLinks/ElementLink.h and AthContainers/DataVector.h rather than DataModel versions (obo Paolo). ATLASSIM-1964. Branch for 20.3.X and 20.6.X. Tagging GeneratorObjects-01-04-00-01 (GeneratorObjects-01-04-00-01)

	* GeneratorObjects/McEventCollection.h,
	GeneratorObjects/xAODTruthParticleLink.h, cmt/requirements -
	switch to using AthLinks/ElementLink.h and
	AthContainers/DataVector.h rather than DataModel versions (obo
	Paolo). ATLASSIM-1964
	* branch for 20.3.X and 20.6.X
	* tagging GeneratorObjects-01-04-00-01

2015-05-14  Paolo Calafiura  <calaf@calaf-C7Z87-OCE>

	* tagging GeneratorObjects-01-04-00
	* GeneratorObjects/HepMcParticleLink.h (HepMcParticleLink):
	clean up types and use uint16_t and uint32_t. Fix AGENE-878