CLN/ENH: Make names getattr'able in core/ops +PEP8.

Now the name passed to a method can be used to get that method from the
NDFrame (previously you had things like `or_ [|]`. better to just have
them all be named exactly what they are s.t. subclasses can do
`getattr(super(self, MyClass), name)(*args, **kwargs)`.

Author: jtratner

doc/source/release.rst

@@ -304,6 +304,7 @@ API Changes
     ``SparsePanel``, etc.), now support the entire set of arithmetic operators
     and arithmetic flex methods (add, sub, mul, etc.). ``SparsePanel`` does not
     support ``pow`` or ``mod`` with non-scalars. (:issue:`3765`)
+  - Arithemtic func factories are now passed real names (suitable for using with super) (:issue:`5240`)
   - Provide numpy compatibility with 1.7 for a calling convention like ``np.prod(pandas_object)`` as numpy
     call with additional keyword args (:issue:`4435`)
   - Provide __dir__ method (and local context) for tab completion / remove ipython completers code