Issue #18829: csv.Dialect() now checks type for delimiter, escapechar and
quotechar fields.  Original patch by Vajrasky Kok.
Issue #20026: Fix the sqlite module to handle correctly invalid isolation level
(wrong type).
Issue #5815: Fixed support for locales with modifiers.  Fixed support for
locale encodings with hyphens.
Issue #19683: Removed empty tests from test_minidom.
Initial patch by Ajitesh Gupta.
Don't use sebTest() in tests for issue #5815.
Merge heads