Another 3-in-one commit:

- Unitialized variable in new shadow code caused Sun lamp shadow to not
  work.
- Ipo handle bug: when the handle was vertical it flipped around
- Loop select: unitialized variable caused it to work unpredictable in
  cases. Also found an unitialized var in collaps_edgeuvs().

source/blender/render/intern/source/shadeoutput.c

@@ -1022,7 +1022,7 @@ float lamp_get_visibility(LampRen *lar, float *co, float *lv, float *dist)
 		return 1.0f;
 	}
 	else {
-		float visifac, t;
+		float visifac= 1.0f, t;
 		
 		VECSUB(lv, co, lar->co);
 		*dist= sqrt( INPR(lv, lv));