TO STAND TRIAL AUBURN (AP) — Joseph A. Blackie Levesque has been found sane and able to stand trial for the murder of Mrs. Marguerite Couture, 37, officials at Augusta State Hospital reported yesterday. Authorities said they plan to bring Levesque to trial during the cur rent term of Superior Court. Mrs Couture was stabbed in her bed Dec. 13 while her husband and two children slept in other bed rooms.