By Denny Dyroff, Entertainment Editor, The Times  Michael Borowski When Michael Borowski performs at the Sellersville Theater (24 West Temple Avenue, Sellersville, 215-257-5808, www.st94.com) on February 2, it will be as close as possible to what he could call a hometown show. The talented pianist grew up 10 minutes southwest of Sellersville in Souderton and now lives about 15 minutes south of the...