Give a better erorr if a test can't find the flags
Add a new input/output test driver which expands .test files
Move all the CPP tests into one file
Add a new package of hint tests
Delete the generated files after testing
Move the cross test into a new test pack
Move the lhs tests over to a new test pack
Merge branch 'master' of https://github.com/ndmitchell/hlint