Fix Spacing around Ellipses

Authors have numerous ways of typing ellipses. Some use the horrid little ellipses "character" available in some symbol fonts. Others type three periods in a row with no spacing in between. And there are many other variations. This option fixes them all, with three periods separated by spaces. (The spaces after the first two ellipsis points are nonbreaking so the ellipsis points won't break at the end of a line.)