improve ThreadingTestCases.test_FSTestCases_in_separate_dirs.
improve ThreadingTestCases.test_FSTestCases_in_separate_dirs.

It's now called "test_cases_in_separate_dirs" and uses tests defined on
self.__class__ rather than the base FSTestCase suite.


git-svn-id: 74b2def6592cf29d88d1a5d33b5c4a2732d8507c@217 67cdc799-7952-0410-af00-57a81ceafa0f

lightkeeper/lspyfilesystem,lightkeeper/lspyfilesystem,atty303/pyfilesystem