Issue #17656: Fix extraction of zip files with unicode member paths.
Issue #16447: Fix potential segfault when setting __name__ on a class.
- Issue #17536: Add to webbrowser's browser list: xdg-open, gvfs-open,
  www-browser, x-www-browser, chromium browsers, iceweasel, iceape.
Revert changes for #13355 by request from Raymond Hettinger
null merge
#17686: fix broken link in Doc/using/unix.rst.  Patch by Dan Riti.
Issue #17016: Get rid of possible pointer wraparounds and integer overflows
in the re module.  Patch by Nickolai Zeldovich.
#2118: clarify smtplib exception documentation.
Reflow paragraph.