Base: misc patches

Convenience macros/function (in Interpreter.h)

* FC_PY_GetObject/Callable(), look for callables in a python object,
  which will be used in future patch to improve performance in various
  python observer/features.

* pyCall(WithKeywords)(), helper function to invoke the callable

Matrix4D:

* hasScale(), check if there is any scale in the transformation. If so,
  further check if the scale is uniform or not. This will be used in
  future patch for Part::TopoShape to decide which type of transform to
  apply.

Placement:

* translate/rotate(), new convenience API

Rotation:

* isSame/multiVec(), new convenience API

Polygon2d:

* Intersect(), GetCenter(), new convenience API.

FlagToggler:

* New class for exception safe flag toggling, similar to StateLocker
  but with template (actually, FlagToggler is added earlier by me).

BitsetLocker:

* New class for exception manipulation of a std::bitset variable.

src/Base/PlacementPy.xml

@@ -44,6 +44,22 @@ Placement(Base, Axis, Angle) -- define position and rotation
 				</UserDocu>
 			</Documentation>
 		</Methode>
+		<Methode Name="translate">
+			<Documentation>
+				<UserDocu>
+					translate(Vector) 
+					alias to move(), to be compatible with TopoShape.translate()
+				</UserDocu>
+			</Documentation>
+		</Methode>
+        <Methode Name="rotate">
+        <Documentation>
+            <UserDocu>
+                rotate(center,axis,degree) - rotate the current placement around center and axis with degree
+                This method is compatible with TopoShape.rotate()
+            </UserDocu>
+        </Documentation>
+        </Methode>
                 <Methode Name="multiply" Const="true">
 			<Documentation>
 				<UserDocu>