Add flipped fmap

[Edward Kmett]

>
> But I don't see much benefit to having (<**>) let alone (<$$>), when they
> are easily defined by using flip. The other clutter of Applicative ((<*),
> (*>),...) can be motivated by performance concerns for certain applicative
> combinator parsers, but I'm not a big fan of them either.
>

While this is a valid concern with regards to <$$>, <**> cannot be defined
in terms of flip as it swaps the order of the effects as well.

-Edward Kmett
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