Process activities bt5 per bt5 upon installation in unit tests.

When installing many bt5, many activities are generated which may take a very
long time to process, instead process them bt5 per bt5 to avoid such issue.

product/ERP5Type/tests/ERP5TypeTestCase.py

@@ -964,6 +964,11 @@ class ERP5TypeCommandLineTestCase(ERP5TypeTestCaseMixin):
         if not quiet:
           ZopeTestCase._print('done (%.3fs)\n' % (time.time() - start))
 
+        # Process Activities after each bt5 installation, otherwise processing
+        # Activities can take forever when installing masterdata bt5s as it
+        # generate many activities
+        self.tic(verbose=1)
+
     def setUpERP5Site(self,
                      business_template_list=(),
                      quiet=0,