apply_case: more robust handling of bounds; moved norm_hhf to Pure/tactic.ML;
apply_case: more robust handling of bounds;
moved norm_hhf to Pure/tactic.ML;

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