Introduce support for themeable border around the game field.
Idea belongs to (guess who) Eugene. He already adjusted current default theme to include border for me to play with while implementing this feature. Not sure if it's the final one :) Ah, and older themes still will work - KLines will figure out whether theme has a border element and act accordingly. Waiting for new themes to come up! ;) svn path=/trunk/KDE/kdegames/klines/; revision=772468
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