Another oddball case reached the East Hampton Town Zoning Board of Appeals this week. (Ever notice how the most controversial ones tend to be scheduled for the depths of February?) The question put before the board Tuesday was whether the Dunes, a high-priced, inpatient drug and alcohol rehabilitation center in a residential neighborhood in Northwest Woods, can continue to operate legally as a semi-public facility without a town permit. The town’s top building inspector says it cannot; the Dunes’s lawyers say the question is irrelevant.