Made sketch_plot default to false when absent.

kiplot/out_dxf.py

@@ -21,7 +21,8 @@ class DXF(AnyLayer):
             """ drill_marks what to use to indicate the drill places, can be none, small or full (for real scale) """
             self.polygon_mode = True
             """ plot using the contour, instead of the center line """
-            self.sketch_plot = True
+            self.sketch_plot = False
+            """ don't fill objects, just draw the outline """
 
     @property
     def drill_marks(self):

kiplot/out_hpgl.py

@@ -16,7 +16,8 @@ class HPGL(AnyLayer):
         with document:
             self.mirror_plot = False
             """ plot mirrored """
-            self.sketch_plot = True
+            self.sketch_plot = False
+            """ don't fill objects, just draw the outline """
             self.scaling = 0
             """ scale factor """
             self._drill_marks = 'full'

kiplot/out_ps.py

@@ -20,7 +20,8 @@ class PS(AnyLayer):
             """ plot mirrored """
             self.negative_plot = False
             """ invert black and white """
-            self.sketch_plot = True
+            self.sketch_plot = False
+            """ don't fill objects, just draw the outline """
             self.scaling = 2
             """ scale factor """
             self._drill_marks = 'full'