Fix dig timing. Fix a crash when digging bricks and then changing themes. Re-implement some debug aids. Improve the animation of dug bricks. Show the hero and enemies in front of dug bricks. Improve the animations for standing and falling runners. Factor out some common code in the hero and enemy run() methods. Clean up some obsolete or redundant graphics code.

svn path=/trunk/KDE/kdegames/kgoldrunner/; revision=975751