override assertInPosition from base class

- trying to avoid spurious "Hexiposi not in position"
  messages

script/devices/Hexiposi.py

@@ -114,6 +114,21 @@ class Hexiposi(DiscretePositionerBase):
                     print "Timeout waiting Hexiposi busy"
                     break
                 self.update()   
+                
+    #Retrying after end of move -> once in a while move raises a not in position exception.
+    def assertInPosition(self, pos):
+        retries = 3
+        for i in range(retries):
+            try:
+                super(Hexiposi, self).assertInPosition(pos)
+                return
+            except:                            
+                if i <(retries-1):
+                    time.sleep(0.5)            
+                else:
+                    raise
+            
+        
 
     def is_in_position(self, pos):
         return self.take() == pos