Generate a blank image for lines/walls if one doesn't exist.
Merge branch 'master' of ssh://roboclub.org/home/svn/scoutos
Added race_walls again, whoops.
Added a new grid map for testing.
Updated scout size. Now 1px = 0.5cm.
Added initial GUI for testing, renamed cw and ccw behaviors
Also added new testing files for sonar - maps/racetest*.bmp
Added sonar, though it looks buggy.
Use sonar_viz to continue debugging and make sonar work!
Added walls to the scoutsim visualizer.
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