Avoid orphan flexible instances in Cabal-TestSuite documentation

[guest]

The example code shown in  http://www.haskell.org/cabal/release/cabal-1.10.1.0/doc/users-guide/#test-suites needs FlexibleInstances?, and the instance is orphan, too. Although this code is not intended to be used in most packages, it still looks like those instances are necessary or at least good style. I suggest to replace the generic pair by a custom data type like

data TestCase = TestCase String Bool

instance TestOptions TestCase where
   ...

in the documentation. Since Cabal is a widely used library, it has automatically an educational aspect.

[ttuegel]

This bug will likely be fixed anyway when the new detailed test interface is released, but I'm assigning it to myself so it isn't forgotten.

[elga]

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