[Patches] regression test finalization

[Vladimir Marangozov]

Feature-specific modules keep being imported until the end of
the test suite. This increases unnecessarily the overall memory
consumption. This patch suggests a best effort per-test finalization
by unloading the newly imported modules after every test.

If not convinced in the usefulness of the patch, I can provide figures.

-- 
       Vladimir MARANGOZOV          | Vladimir.Marangozov@inrialpes.fr
http://sirac.inrialpes.fr/~marangoz | tel:(+33-4)76615277 fax:76615252

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-------------------------------[ cut here ]---------------------------  
*** Lib/test/regrtest.py-orig	Wed Apr 12 06:09:22 2000
--- Lib/test/regrtest.py	Wed Apr 12 06:08:38 2000
***************
*** 105,110 ****
--- 105,111 ----
      if single:
          tests = tests[:1]
      test_support.verbose = verbose      # Tell tests to be moderately quiet
+     save_modules = sys.modules.keys()
      for test in tests:
          if not quiet:
              print test
***************
*** 118,123 ****
--- 119,128 ----
                  print "test", test,
                  print "skipped -- an optional feature could not be imported"
              skipped.append(test)
+         # Unload the newly imported modules (best effort finalization)
+         for module in sys.modules.keys():
+             if module not in save_modules:
+                 test_support.unload(module)
      if good and not quiet:
          if not bad and not skipped and len(good) > 1:
              print "All",