Journal and database testing. - Add to Import/Export test to also test that journals are correctly retrieved - Fix a bug in anydbm backend that didn't export journal 'set' actions where the previous value was None -- all other backends export them correctly so I consider this a bug of anydbm - Fix journal import/export of Date and Interval for metakit - Fix journal import of Password for metakit - Fix setting of Password oldvalue for metakit -- this would be written as the string "None" instead of the value None. Note that existing databases *will* have wrong log-entries. Since this is only for passwords -- and old passwords aren't of much importance -- I consider this fix to be enough... This fix makes the Journal import/export test run for metakit.

class MockNull:
    def __init__(self, **kwargs):
        for key, value in kwargs.items():
            self.__dict__[key] = value

    def __call__(self, *args, **kwargs): return MockNull()
    def __getattr__(self, name):
        # This allows assignments which assume all intermediate steps are Null
        # objects if they don't exist yet.
        #
        # For example (with just 'client' defined):
        #
        # client.db.config.TRACKER_WEB = 'BASE/'
        self.__dict__[name] = MockNull()
        return getattr(self, name)

    def __getitem__(self, key): return self
    def __nonzero__(self): return 0
    def __str__(self): return ''
    def __repr__(self): return '<MockNull 0x%x>'%id(self)
    def gettext(self, str): return str
    _ = gettext