Matt McClure committed ef54ca6

Document the new difference between unittest2 and Python 2.7

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 documented as being empty and subclasses shouldn't need to call it. This would
 make the change backwards incompatible and needs thinking about.
+In Python 2.7 the ``TestSuite`` held references to each ``TestCase``
+after ````. In unittest2, ```` sets those
+references to None so that the garbage collector can free their memory.
+Subclasses can restore the earlier behavior by overriding