It may not be as dramatic as 'Doubt' or as funny as 'Moonstruck,' but John Patrick Shanley has not written a more beautiful or loving play than 'Outside Mullingar.' The rural dialect spoken on the farms and villages of Ireland translates into prickly poetry under Doug Hughes' helming of this bittersweet family drama about the unresolved issues between cantankerous parents and their obstinate offspring. Playing neighbors whose families are caught up in a bizarre feud over a contested strip of land that separates their two farms, Debra Messing and Brian F. O'Byrne are a match made in heaven.