moved lemmas from FSet.thy to do with atom to Nominal2_Base, and to do with 'a::at set to Nominal2_Atoms; moved Nominal2_Eqvt.thy one up to be loaded before Nominal2_Atoms

no_document use_thys
   ["Nominal2_Base",
    "Nominal2_Eqvt",
    "Nominal2_Atoms",
    "Nominal2_Supp",
    "Atoms"];