collect garbage between each hundreds of objects generation otherwise time to...

collect garbage between each hundreds of objects generation otherwise time to do the tic is increasing with the running-time
This is due to the move to zope2.8 and the use of new extension class



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@24804 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/tests/testPerformance.py

@@ -198,7 +198,7 @@ class TestPerformance(ERP5TypeTestCase, LogInterceptor):
           before_tic = time()
           self.tic()
           after_tic = time()
-
+	  gc.collect()
           before_form = time()
           for x in xrange(100):
             self.bar_module.BarModule_viewBarList()