Add turtle param to polygonWall

to allow using it as turtle graphic command instead of a part

boxes/__init__.py

@@ -1864,7 +1864,8 @@ class Boxes:
 
         return ext
 
-    def polygonWall(self, borders, edge="f", callback=None, move=None):
+    def polygonWall(self, borders, edge="f", turtle=False,
+                    callback=None, move=None):
 
         e = self.edges.get(edge, edge)
         t = self.thickness # XXX edge.margin()
@@ -1872,6 +1873,8 @@ class Boxes:
         minx, miny, maxx, maxy = self._polygonWallExtend(borders, e)
 
         tw, th = maxx - minx, maxy - miny
+
+        if not turtle:
             if self.move(tw, th, move, True):
                 return
         
@@ -1893,6 +1896,7 @@ class Boxes:
             self.edge(length_correction)
             self.corner(next_angle, tabs=1)
 
+        if not turtle:
             self.move(tw, th, move)
 
     @restore