Up to Python 3.8, __file__ returns a relative path for the main script
specified on the command line. Use `Path.resolve()` to make it absolute before
calling `Path.parents`.
https://docs.python.org/3/whatsnew/3.9.html#other-language-changes

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9277 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

Running standard unittest on the test suite resulted in 89 ImportErrors
because ``import DocutilsTestSupport was used to set up sys.path()
but the module could not be found on the original sys.path().

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9274 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

Previously, the test suite only worked when the current working
directory was ``docutils/test/`. With this change all relative paths
are calculated explicitly such that the working directory no longer
affects the tests, meaning a less fragile test environment and 
greater flexibility to use test runners other than ``alltests.py``.
This is part of the test suite refactoring project.

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9236 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

- Move all usages of ``testroot`` to defining and using a 
  ``TEST_ROOT`` constant within the module, as part of the test
  suite refactoring project
- Avoid ``os.chdir`` calls within ``test_error_reporting``

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9234 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

The working directory is set to ``testroot`` in the initialisation
of ``DocutilsTestSupport``, meaning we do not need to set it to the
same directory in each test.


git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9144 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9068 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

New interface function: frontend.get_default_settings()
easy access to default settings for programmatic use.

Add deprecation warnings.
Catch them when accessing the deprecated functions from Docutils.

Make docstrings conform to the Documentation Policies
(first line: summary, next line empty).

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9047 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

flake8 rule F401

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9037 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

flake8 rule E501: line too long (N > 79 characters)

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9030 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

flake8 rules
E401: multiple imports on one line
E402: module level import not at top of file

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9027 929543f6-e4f2-0310-98a6-ba3bd3dd1d04