ref: 81c65eeac18b3c5f2c869678b3fe03e2bd46ddc2
parent: c3c186d687b5e48e058cb5b2e832e48530caf8e5
author: Simon Tatham <anakin@pobox.com>
date: Tue Jan 5 13:26:44 EST 2010
Missing piece of code I should have cribbed from Solo: we have to lay out large numbers of pencil marks differently in a square containing a clue. [originally from svn r8807]