-Ystatistics accepts a list of phases for which to print stats

Also cleaned up handling of defaults in MultiChoiceSetting.
OK, let's see, before, the deprecated warning cascaded to the lint flag; now, the lint flag consults the deprecated alias.  

There are different ways of encoding it, but personally I prefer two methods, lintFlag and warnFlag, to the boolean param which does either a or b, and by the way don't supply an alias if not lint.