Fix more pathfinding issues.

Change the way the long-range pathfinder rasterisation works slightly so
that we have a better compatibility with the short-range pathfinder.
Should fix the "stuck units" issues, though I am not sure so I am not
marking them as fixed so far. Refs #3471, #3505, and possibly #3292.

Caveat: I am now using clearance of 0.8 for "default" class, which might
have side-effects: please report anything weird.

Also fix leftover style issues.

This was SVN commit r17161.

source/simulation2/components/CCmpUnitMotion.cpp

@@ -1042,7 +1042,9 @@ void CCmpUnitMotion::PlanNextStep(const CFixedVector2D& pos)
 		return;
 
 	CmpPtr<ICmpPathfinder> cmpPathfinder(GetSystemEntity());
-
+	if (!cmpPathfinder)
+		return;
+	
 	const Waypoint& nextPoint = m_LongPath.m_Waypoints.back();
 
 	// The next step was obstructed the last time we checked; also check that