criminal contempt; failure to appear can constitute interference with a court's lawful process and serve as basis for criminal contempt; jurisdiction to review plenary proceedings for criminal contempt appealed from district court to superior court; nature of de novo review of plenary proceedings of criminal contempt in superior court; notice required for plenary proceedings for criminal contempt and validity of show cause order to provide notice; erroneous failure to apply beyond a reasonable doubt standard of proof in plenary proceeding for criminal contempt in district court was not a jurisdictional defect; testimony by judicial official who presided over prior proceeding was permissible in subsequent proceeding before different judicial official on appeal from prior proceeding