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 ``exception_data`` to using the ``try`` /
  ``except`` pattern as part of the test suite refactoring project

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9232 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

This removes the now unused ``StandardTestCase``, ``CustomTestCase``,
and ``CustomTestSuite``.

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9231 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

- Move all usages of ``ParserTestSuite.generateTests``
  to using subtests, as part of the test suite refactoring project

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9230 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

- Move all usages of ``TransformTestSuite.generateTests``
  to using subtests, as part of the test suite refactoring project
- Fix the global state issues with ``test_hyperlinks_de`` and run
  the test as part of ``alltests.py``

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9229 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

- Move all usages of ``WriterPublishTestCase`` to using subtests, as
  part of the test suite refactoring project.

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9228 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

- Move all usages of ``PublishTestSuite.generateTests``
  to using subtests, as part of the test suite refactoring project

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9227 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9226 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

- Move all usages of ``PEPParserTestSuite.generateTests``
  to using subtests, as part of the test suite refactoring project

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9225 929543f6-e4f2-0310-98a6-ba3bd3dd1d04