Fix scaling resolution bug for Obj2s.

- symbolic rendering of 2D objects was removing a Scale2 but not
  chainging the resolution, leading to weird bugs. This is now fixed.

Graphics/Implicit/Export/SymbolicObj2.hs

@@ -45,16 +45,17 @@ symbolicGetContour _ (RectR 0 (x1,y1) (x2,y2)) = [[ (x1,y1), (x2,y1), (x2,y2), (
 symbolicGetContour res (Circle r) = [[ ( r*cos(2*pi*m/n), r*sin(2*pi*m/n) ) | m <- [0.. n] ]] where
 	n = max 5 (fromIntegral $ ceiling $ 2*pi*r/res)
 symbolicGetContour res (Translate2 v obj) = map (map (+ v) ) $ symbolicGetContour res obj
-symbolicGetContour res (Scale2 s obj) = map (map (⋯* s)) $ symbolicGetContour res obj
+symbolicGetContour res (Scale2 s@(a,b) obj) = map (map (⋯* s)) $ symbolicGetContour (res/sc) obj
+	where sc = max a b
 symbolicGetContour res obj = case rebound2 (getImplicit2 obj, getBox2 obj) of
 	(obj, (a,b)) -> Render.getContour a b res obj
 
 
 symbolicGetContourMesh :: ℝ ->  SymbolicObj2 -> [(ℝ2,ℝ2,ℝ2)]
 symbolicGetContourMesh res (Translate2 v obj) = map (\(a,b,c) -> (a + v, b + v, c + v) )  $
 	symbolicGetContourMesh res obj
-symbolicGetContourMesh res (Scale2 s obj) = map (\(a,b,c) -> (a ⋯* s, b ⋯* s, c ⋯* s) )  $
-	symbolicGetContourMesh res obj
+symbolicGetContourMesh res (Scale2 s@(a,b) obj) = map (\(a,b,c) -> (a ⋯* s, b ⋯* s, c ⋯* s) )  $
+	symbolicGetContourMesh (res/sc) obj where sc = max a b
 symbolicGetContourMesh _ (RectR 0 (x1,y1) (x2,y2)) = [((x1,y1), (x2,y1), (x2,y2)), ((x2,y2), (x1,y2), (x1,y1)) ]
 symbolicGetContourMesh res (Circle r) = 
 	[ ((0,0),