added stuff

geo/Heading.h

@@ -46,6 +46,11 @@ public:
 		return (Heading(*this) += _rad);
 	}
 
+        Heading& operator = (const float _rad) {
+            rad = _rad;
+            return *this;
+        }
+
 	/** compare two headings */
 	bool operator == (const Heading other) const {return rad == other.rad;}
 	bool operator != (const Heading other) const {return rad != other.rad;}