added instantiate_tac, cut_inst_tac, forw_inst_tac, dres_inst_tac, make_elim_preserve (from tactic.ML); pervasive operations; tuned;
added instantiate_tac, cut_inst_tac, forw_inst_tac, dres_inst_tac, make_elim_preserve (from tactic.ML);
pervasive operations;
tuned;

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