Get ready for a big day.Here are the five things you need to know before the opening bell rings in New York: 1. Massive pharma takeover at risk: Various media outlets are reporting that U.S.-based Pfizer is set to drop its planned $160 billion takeover of Ireland-based Allergan. Both companies declined to comment on the reports.This comes after the U.S. Treasury introduced new regulations on Monday designed to deter U.S. ...