move new "direction" argument to end of list in case someone uses old…

… interface to make the call.

src/sas/qtgui/Plotting/Slicers/BoxSlicer.py

@@ -19,7 +19,7 @@ class BoxInteractor(BaseInteractor, SlicerModel):
     function of Q_x and BoxInteractorY averages all the points from
     -x to +x as a function of Q_y
     """
-    def __init__(self, base, axes, item=None, color='black',  direction=None,zorder=3):
+    def __init__(self, base, axes, item=None, color='black', zorder=3, direction=None):
         BaseInteractor.__init__(self, base, axes, color=color)
         SlicerModel.__init__(self)
         # Class initialization
@@ -776,7 +776,7 @@ class BoxInteractorX(BoxInteractor):
     """
 
     def __init__(self, base, axes, item=None, color='black', zorder=3):
-        BoxInteractor.__init__(self, base, axes, item=item, direction="X",color=color)
+        BoxInteractor.__init__(self, base, axes, item=item, color=color, direction="X")
         self.base = base
         super()._post_data()
 
@@ -810,7 +810,7 @@ class BoxInteractorY(BoxInteractor):
     """
 
     def __init__(self, base, axes, item=None, color='black', zorder=3):
-        BoxInteractor.__init__(self, base, axes, item=item, direction="Y", color=color)
+        BoxInteractor.__init__(self, base, axes, item=item, color=color, direction="Y")
         self.base = base
         super()._post_data()