WASHINGTON — Tired of those annoying, sometimes costly, robocalls favored by scammers? The Federal Communications Commission is being asked to consider whether more can be done to block the automated phone calls, but the options appear to be limited. The convergence of Internet and phone lines has made it easier to blast out hundreds of thousands of calls in a matter of minutes to see who takes the bait. The question of whether these calls can be blocked has never been more pressing than around tax season …