cmake modules:
    - ariles_add_regression_test.cmake
      adds a regression test for the core or a submodule

    - ariles_add_test.cmake
      adds a simple test for the core or a submodule

    - ariles_copy_extra_test_files
      add custom target to copy extra files for a particular test.

    - ariles_define_regression_test.cmake
      define regression test.

    - ariles_parse_test_dependencies.cmake
      parse test dependencies -- should be called from ariles_define_regression_test
