Deleted some useless things and made proofs of refl_comp_subset and comp_equivI more like the versions in ZF/EquivClass.ML
Deleted some useless things and made proofs of
refl_comp_subset and comp_equivI more like the versions in ZF/EquivClass.ML

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle