[test] make unittest_webconfig independant of CWD if apphome is unset in ApptestConfiguration constructor, this later looks for a 'data' directory in CWD, making this test runnable only from web/test (and pytest do chdir before executing tests, so we did not noticed this problem).

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from yams.buildobjs import RelationDefinition

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class ARelation(RelationDefinition):

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    subject = 'CWUser'

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    object = 'CWGroup'