zero-initialize all fields, fixing compiler warnings seen when building
extension modules with gcc with "-Wmissing-field-initializers" (implied
by "-W")

Patch by Robert Collins.

informative adjunct to the docs.  Forward-port of Raymond's r86225 and
r86245 using the new source reST role added in #10334.

rather than strings.

enough).  Also, use setUpClass in order to connect only once per test run.

standard IMAP4 connections.  Original patch by Lorenzo M. Catucci.

--no commit message

Patch by Chris Rebert.