Turnt

------------------

- Run tests in parallel with `-j`.

------------------

- Support options in directory tests (the `opts_file` config option).
- Outputs from directory tests go to `dirname/out.ext` instead of
`dirname/dirname.ext`.

------------------

- The diff command is now configurable.
- We use a unified diff by default.

------------------

- A new `--args` option lets you override the `args` field that otherwise comes from in-file settings.
- You can now capture the standard error from a command. In the same way that the `-` pseudo-file indicates the standard output, `2` now indicates the standard error.
- Tests can now have (non-zero) expected return codes. Use `return_code` in the configuration file or `RETURN` in file comments.

------------------

A new `--print` option enables a convenient mode for debugging tests that just shows the output instead of checking any results.

------------------

Initial release.