Remove test_doctest's expected-output file.
Change test_doctest and test_difflib to pass regrtest's notion of
verbosity on to doctest.
Add explanation for a dozen "new" things to test/README.
diff --git a/Lib/test/test_difflib.py b/Lib/test/test_difflib.py
index 99cd8ef..3b2f821 100644
--- a/Lib/test/test_difflib.py
+++ b/Lib/test/test_difflib.py
@@ -1,2 +1,3 @@
+from test_support import verbose
import doctest, difflib
-doctest.testmod(difflib, verbose=0)
+doctest.testmod(difflib, verbose=verbose)