William Barclay tells of a November day when he saw a notice on a bulletin board of the London Central YMCA saying that Basil Oliver had died and that the funeral was to be that day, with a memorial service the following week. By the nature of the bulletin, Barclay said, you would have thought Oliver was a very important person--and in a sense, you would have been right, for everyone who had anything to do with the Central YMCA in London kn…