Simplify keyword arguments in wrapped functors.

No need to use DoubleAttributes if direct access works as well.

Author: pavoljuhas

diffpy/srreal/wraputils.py

@@ -102,8 +102,7 @@ def __call__(self, x):
             '''Evaluate this functor at x.
             '''
             if dbattrs:
-                kw = dict([(n, self._getDoubleAttr(n))
-                        for n in self._namesOfWritableDoubleAttributes()])
+                kw = {n : getattr(self, n) for n in dbattrs}
                 rv = fnc(x, **kw)
             else:
                 rv = fnc(x)