Add --verbose option that would list test cases on the screen as they are passed.

[kindaro]

I have about a dozen of test cases in one of my projects. Sometimes I get suspicious if I mistyped something and if all the cases actually run. (especially since, for some reason, it reports 12 successes if ran from cabal and 16 if ran manually) So, I thought, it would be useful if there were a "verbose" option that would let me know what cases are executed, exactly.

I can submit a pull request in about a week, if there is consensus and some general advice from maintainers.

[andreasabel]

I think this is a great idea!

As a general rule, such a new feature would also have to be covered by doctest's own testsuite, and be documented in the CHANGELOG and (I suppose) in the README. :)

[kindaro]

This is actually sort of a duplicate of #132. As we solve this, we can close that other too.

[sol]

On master.