Proposal: Add Functor instances for ArgOrder, OptDescr and ArgDescr

[Bas van Dijk]

Hello,

I recently needed Functor instances for the types in System.Console.GetOpt.

Note that the test-framework package also defines[1] these instances.

Discussion deadline: 1 week (I assume this is a no-brainer).

Regards,

Bas

[1] http://hackage.haskell.org/packages/archive/test-framework/0.6.1/doc/html/src/Test-Framework-Runners-Console.html
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