Dan Aykroyd is a very generous tipper. After dining with a mammoth party of 34 at popular Lower East Side eatery Stanton Social, the “Ghostbusters” star left a whopping $1,900 gratuity on a $4,200 bill. “He and his friends were drinking martinis and wine all night,” says one delighted diner. “He was a really nice guy. He took pictures with anyone who asked.”