This episode's headline: Stockman Resigns; California Fires; Progress on Parkinson's; Gun Control Debate. The guests include In Washington: LAURENCE BARRETT, Time Magazine; WARREN CASSIDY, National Rifle Association; Sen. HOWARD METZENBAUM, Democrat, Ohio; In Sacramento: BILL MEDICOVICH, Fire Co-coordinator. Byline: In New York: JIM LEHRER, Associate Editor; In Washington: JUDY WOODRUFF, Correspondent