Orson Welles completists should drop all other plans and attend the two programs titled The Unknown Orson Welles scheduled this weekend at the Pacific Film Archive in Berkeley. Archivist Stefan Drossler, director of the Munich Filmmuseum, will introduce both matinees. On Saturday, January 17, at 5 p.m., My Name Is Orson Welles will include excerpts from his television appearances, including rare Shakespeare footage and Welles' travel documentaries.. On Sunday, January 18, at 2 p.m., Unfinished W