Improve uroboro.cabal

[Toxaris]

I'm confused about the following aspects of uroboro.cabal:

1. The test suite doesn't mention the test modules in other-modules. I fear this breaks cabal sdist which is necessary for releasing uroboro to Hackage.
2. The test suite pulls in the Haskell files in src in addition to depending on the uroboro library. This means that the library is recompiled when the test suite is compiled. The edit-compile-test cycle would be faster if this recompilation would be avoided.
3. The -fhpc flag produces a tests.exe.tix file. It seems I have to manually delete this file every time I change something and then run cabal test. Or should I be doing something else to test a change?

[Toxaris]

@tewe explained that (2) is necessary to get test coverage information. Maybe we can declare a flag in the cabal file to turn test coverage information on or off, setting it to off by default?

[tewe]

GHC 7.10 changed a lot of things, breaking my test environment, so not closing this yet.

How useful are upper boundaries on versions for dependencies? That aren't ghc...