----------------
- Update the doctest copy with text-file encoding support.
- Add logging-level support to the ``loggingsuppport`` module.
- At verbosity-level 1, dots are not output continuously, without any
line breaks.
- Improve output when the inability to tear down a layer causes tests
to be run in a subprocess.
- Make ``zope.exception`` required only if the ``zope_tracebacks`` extra is
requested.
- Fix the test coverage. If a module, for example `interfaces`, was in an
ignored directory/package, then if a module of the same name existed in a
covered directory/package, then it was also ignored there, because the
ignore cache stored the result by module name and not the filename of the
module.