Commuters and merchants in South Station say they are fed up with Occupy Boston squatters who are hogging electrical outlets and taking sponge baths in bathroom sinks, turning the bustling terminal into a unsanitary locker room. Transportation officials said they have sealed up some outlets after fearful commuters worried Occupy members powering up electronic gadgets close to ATM machines could see PIN numbers being punched in. Yet, there’s no quick solution to sharing the bathroom. “The bathrooms seem more crowded and grimier,” said Roy Woodton, 36, a banker from Attleboro as he rushed to catch a train yesterday. “They are...