Boston’s Museum of Fine Arts announces a schedule for its $500 million expansion. And how is the project being paid for? “Galleries are going fast,” museum director Malcom Rogers said. “But I do know, for instance, that the galleries of pre-Columbian art are still available. We also have the major American paintings galleries, where one or two of those are open at the moment. And also, people like to name endowment funds, funds supporting exhibitions, lectures, concerts.”