Issue #16447: Fix potential segfault when setting __name__ on a class.
Revert changes for #13355 by request from Raymond Hettinger
Issue #17715: Add missing NULL Check to PyNumber_Long.
#17686: fix broken link in Doc/using/unix.rst.  Patch by Dan Riti.
#17571: remove broken links in datetime.py docstring.
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.