Sorrow Mixed With Disbelief For Patrons Of Community
Neighbors of Rigas family in Couderport, Pa, express disbelief at guilty verdicts against John J Rigas, founder of Adelphia Communications, and his son Timothy; many people there still see Rigases as modest men who never lost sight of their small-town roots and who gave community luxuries it would otherwise not have; Judge Leonard B Sands will give jurors additional instructions to try to break deadlock on remaining counts; photo (M)