documented a few methods

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2206 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/kart.hpp

@@ -153,7 +153,12 @@ public:
     void           getClosestKart      (float *cdist, int *closest);
     void           updatePhysics       (float dt);
 
-    btTransform getKartHeading();
+    /**
+        returns a bullet transform object located at the kart's position
+        and oriented in the direction the kart is going. Can be useful
+        e.g. to calculate the starting point and direction of projectiles
+     */
+    btTransform    getKartHeading      (const float customPitch=-1);
     
     // Functions to access the current kart properties (which might get changed,
     // e.g. mass increase or air_friction increase depending on attachment etc.)