Norwich manager Chris Hughton is confident there is more to come from Jonny Howson after the midfielder signed a new four-and-a-half-year deal at the Barclays Premier League club.Howson, 25, joined the Canaries from Leeds in January 2012 and has made 60 appearances, scoring five times including a fine individual effort on the final day of last season at Manchester City.Hughton - who brought in hal