added "no_assms" option to Refute, and include structured proof assumptions by default;
will do the same for Quickcheck unless there are objections
header {* Plain HOL *}
theory Plain
imports Datatype Record FunDef Extraction
begin
text {*
Plain bootstrap of fundamental HOL tools and packages; does not
include @{text Hilbert_Choice}.
*}
ML {* path_add "~~/src/HOL/Library" *}
end