* Consolidated version numbering documentation in docs/dev/policies.txt (moved text from docs/dev/release.txt).
* Updated docutils.utils.version_identifier for Python 2.6 (docutils.VersionInfo).
* Moved code from tests/test/test_utils.py::HelperFunctionsTests.test_version_identifier to tests/test__init__.py::VersionInfoTests.test_version_identifier; uncommented lines in tests/test__init__.py::VersionInfoTests.test_version_info.
* Added new tests/test/test_utils.py::HelperFunctionsTests.test_version_identifier.
git-svn-id: http://svn.code.sf.net/p/docutils/code/trunk@8165 929543f6-e4f2-0310-98a6-ba3bd3dd1d04