Issue #16039: CVE-2013-1752: Change use of readline in imaplib module to limit
line length.  Patch by Emil Lind.
Issue #19405: Fixed outdated comments in the _sre module.
Issue #17997: Change behavior of ``ssl.match_hostname()`` to follow RFC 6125,
for security reasons.  It now doesn't match multiple wildcards nor wildcards
inside IDN fragments.
Issue #16041: CVE-2013-1752: poplib: Limit maximum line lengths to 2048 to
prevent readline() calls from consuming too much memory.  Patch by Jyrki
Pulliainen.
Issue #16040: CVE-2013-1752: nntplib: Limit maximum line lengths to 2048 to
prevent readline() calls from consuming too much memory.  Patch by Jyrki
Pulliainen.
Issue #16037: HTTPMessage.readheaders() raises an HTTPException when more than
100 headers are read.  Adapted from patch by Jyrki Pulliainen.
merge
Issue #19227: Try to fix deadlocks caused by re-seeding then OpenSSL
pseudo-random number generator on fork().
Update pydoc topics.
Fix markup errors in the docs and amend suspicious ignores.
Bump to 3.3.3rc1.
Skip overzealous test for existence of the online license.html for pre-release versions.
Added tag v3.3.3rc1 for changeset fd53c500f8b8
Fixed merge test for Tcl/Tk <8.5 (issue #18964).