By Denny Dyroff, Staff Writer, The Times  Marillion On November 6, the Keswick Theater (291 N. Keswick Avenue, Glenside, 215-572-7650, www.keswicktheatre.com) will present a show featuring two acts with musical histories that date back to the early 1980s – British band Marillion and American singer-songwriter-guitarist John Wesley. Marillion, which formed in Buckinghamshire, England is a progressive...