'Add a new rotation+free handle to the ROI. When dragging a handle of
this type, the user can rotate the ROI around an
arbitrary center point, while moving toward or away from the center
point has no effect on the shape of the ROI.
**Arguments**
pos                 (length-2 sequence) The position of the handle
relative to the shape of the ROI. A value of (0,0)
indicates the origin, whereas (1, 1) indicates the
upper-right corner, regardless of the ROI\'s size.
center              (length-2 sequence) The center point around which
rotation takes place.
item                The Handle instance to add. If None, a new handle
will be created.
name                The name of this handle (optional). Handles are
identified by name when calling
getLocalHandlePositions and getSceneHandlePositions.'

def addRotateFreeHandle(self, pos, center, axes=None, item=None, name=None, index=None):

    pos = Point(pos)
    center = Point(center)
    return self.addHandle({'name': name, 'type': 'rf', 'center': center, 'pos': pos, 'item': item}, index=index)
