restored notation for less/less_eq (observe proper order of mixfix annotations!); simplified notation for greater/greater_eq, which is only used for input; removed duplicate abbreviations (implicit inheritance);
restored notation for less/less_eq (observe proper order of mixfix annotations!);
simplified notation for greater/greater_eq, which is only used for input;
removed duplicate abbreviations (implicit inheritance);

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