Base: [skip ci] support of __round__ of QuantityPy

src/Base/QuantityPy.xml

@@ -48,6 +48,14 @@ Quantity(string) -- arbitrary mixture of numbers and chars defining a Quantity
         </UserDocu>
       </Documentation>
     </Methode>
+    <Methode Name="__round__" Const="true">
+      <Documentation>
+        <UserDocu>
+Return the Integral closest to x, rounding half toward even.
+When an argument is passed, work like built-in round(x, ndigits).
+        </UserDocu>
+      </Documentation>
+    </Methode>
     <Attribute Name="Value" ReadOnly="false">
 			<Documentation>
 				<UserDocu>Numeric Value of the Quantity (in internal system mm,kg,s)</UserDocu>