Patch by Erik Welch.

prevents http://buildbot.python.org/all/builders/x86%20Ubuntu%20Shared%203.x/builds/240/steps/test/logs/stdio

exited to a stopped instead of terminated state (ex: when under ptrace).

Patch by Ammar Askar.

It got messed up when I merged my private 3.5.3 release
changes with new work happening in the 3.5 main branch.
(3.5 main branch was in "3.5.3rc1", my branch was "3.5.3+",
and Mercurial helpfully merged the two in a kind of nonsense way.)

* Indent versionchanged at method level, not class level
* Mark up ``--help`` to avoid generating an en dash
* Use forward slash in Unix command line with a dollar sign ($) prompt

Extracted from revision a1daf2d289ad by Zachary Ware.

ctypes.CDLL instances.

KeyError could be raised when cached function with full cache was
simultaneously called from differen threads with the same uncached arguments.

Windows requires at least the SYSTEMROOT environment variable to start Python.
If run_python_until_end() doesn't copy SYSTEMROOT, the function always fail on
Windows.