Add Stripping 28r2p1 archive

Mark Smithrequested to merge
cache_merge_2018_patches into 2018-patches

This one adds the StrippingArchive of 28r2p1: Phys/StrippingArchive/python/StrippingArchive/Stripping28r2p1 + update __init__.py And the CommonParticlesArchive: Phys/CommonParticlesArchive/python/CommonParticlesArchive @fredi @ngrieser

Edited by Mark Smith

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