__ne__() logic

[bblay]

Following on from #633, implmentations of __ne__ which look for NotImplemented should be calling __eq__ directly, rather than ==, because the return value get's booled.
So from this:

    # Must supply __ne__, Python does not defer to __eq__ for negative equality
    def __ne__(self, other):
        result = self == other
        if result != NotImplemented:
            result = not result
        return result

To this:

    # Must supply __ne__, Python does not defer to __eq__ for negative equality
    def __ne__(self, other):
        result = self.__eq__(other)
        if result != NotImplemented:
            result = not result
        return result

[cpelley]

wow thats a rather unexpected behavioural difference