Inspired by SF patch #860326, make the exception formatting by
traceback.py be closer to the built-in formatting.
A few unittests had to be fixed, too.
diff --git a/Lib/test/test_unpack.py b/Lib/test/test_unpack.py
index 3f72648..cd48689 100644
--- a/Lib/test/test_unpack.py
+++ b/Lib/test/test_unpack.py
@@ -107,7 +107,7 @@
     >>> a, b, c, d, e = BadSeq()
     Traceback (most recent call last):
       ...
-    BozoError
+    test.test_unpack.BozoError
 
 Trigger code while expecting an IndexError (unpack sequence too short, wrong
 error)
@@ -115,7 +115,7 @@
     >>> a, b, c = BadSeq()
     Traceback (most recent call last):
       ...
-    BozoError
+    test.test_unpack.BozoError
 
 """