Discover and run all test modules in the project

[luolong]

When running ceylon test tool, one has to enumerate all test modules to run them.

What about "detecting" all the modules in the project and running all modules that import ceylon.test if no modules are specified?

The problem is with CI tools -- once you've set up CI to test predefined set of modules, you need to update the CI whenever refactoring/splitting modules. It would be much better if all test in a project could be picked up automatically after module refactoring.