Fixing issue 71 with Vladimir's patch

@@ -139,10 +139,12 @@ enum {
 - (void)moveBy: (CGSize) delta;
 - (void)moveBy: (CGSize) delta;
 - (void)zoomByFactor: (float) zoomFactor near:(CGPoint) center;
 - (void)zoomByFactor: (float) zoomFactor near:(CGPoint) center;
 - (void)zoomInToNextNativeZoomAt:(CGPoint) pivot animated:(BOOL) animated;
 - (void)zoomInToNextNativeZoomAt:(CGPoint) pivot animated:(BOOL) animated;
+- (void)zoomOutToNextNativeZoomAt:(CGPoint) pivot animated:(BOOL) animated; 
 - (void)zoomByFactor: (float) zoomFactor near:(CGPoint) center animated:(BOOL) animated;
 - (void)zoomByFactor: (float) zoomFactor near:(CGPoint) center animated:(BOOL) animated;
 - (void)zoomByFactor: (float) zoomFactor near:(CGPoint) center animated:(BOOL) animated withCallback:(id<RMMapContentsAnimationCallback>)callback;
 - (void)zoomByFactor: (float) zoomFactor near:(CGPoint) center animated:(BOOL) animated withCallback:(id<RMMapContentsAnimationCallback>)callback;
 
 
 - (void)zoomInToNextNativeZoomAt:(CGPoint) pivot;
 - (void)zoomInToNextNativeZoomAt:(CGPoint) pivot;
+- (void)zoomOutToNextNativeZoomAt:(CGPoint) pivot; 
 - (float)adjustZoomForBoundingMask:(float)zoomFactor;
 - (float)adjustZoomForBoundingMask:(float)zoomFactor;
 - (void)adjustMapPlacementWithScale:(float)aScale;
 - (void)adjustMapPlacementWithScale:(float)aScale;
 - (void)setZoomBounds:(float)aMinZoom maxZoom:(float)aMaxZoom;
 - (void)setZoomBounds:(float)aMinZoom maxZoom:(float)aMaxZoom;

@@ -414,6 +414,23 @@
 	}
 	}
 }
 }
 
 
+- (void)zoomOutToNextNativeZoomAt:(CGPoint) pivot animated:(BOOL) animated {
+       // Calculate rounded zoom
+       float newZoom = roundf([self zoom] - 1);
+      
+       if (newZoom <= [self minZoom])
+               return;
+       else {
+               float factor = exp2f(newZoom - [self zoom]);
+               [self zoomByFactor:factor near:pivot animated:animated];
+       }
+}
+
+- (void)zoomOutToNextNativeZoomAt:(CGPoint) pivot {
+       [self zoomOutToNextNativeZoomAt: pivot animated: FALSE];
+}
+ 
+
 - (void) drawRect: (CGRect) aRect
 - (void) drawRect: (CGRect) aRect
 {
 {
 	[renderer drawRect:aRect];
 	[renderer drawRect:aRect];