Fixed a floating point rounding error preventing faces from being found for some world-space points. Fixes lighting bugs in a few areas.

bsp.h

@@ -371,6 +371,7 @@ typedef struct World
                 }
 
                 double dot = p0.dotProduct(p1) / (m0 * m1);
+                if (dot < -1) dot = -1; if (dot > 1) dot = 1;   // Floating point rounding errors, YAY!
                 angleSum += acos(dot);
             }