- reorganized structure of ZCatalog unittests

- tests/test*.py now runs with testrunner
- regressiontests/*.py are based on unittest but require a
  mailbox files as input for tests

lib/python/Products/ZCatalog/tests/testCatalogTiming.py → lib/python/Products/ZCatalog/regressiontests/regressionCatalogTiming.py

@@ -25,6 +25,11 @@ from Products.ZCatalog import ZCatalog
 from unittest import TestCase, TestSuite, JUnitTextTestRunner,\
      VerboseTextTestRunner, makeSuite
 
+from Products.PluginIndexes.FieldIndex.FieldIndex import FieldIndex
+from Products.PluginIndexes.TextIndex.TextIndex import TextIndex
+from Products.PluginIndexes.TextIndex.Lexicon import  Lexicon
+from Products.PluginIndexes.KeywordIndex.KeywordIndex import KeywordIndex
+
 from Testing.makerequest import makerequest
 
 TextTestRunner = VerboseTextTestRunner