SSLError on socket timeouts.

argparse (#10528).

There is no unit test; I checked with xgettext that no more warnings
were emitted.  Steven approved the change.

Steven, the maintainer of argparse, agreed to have this committed
without tests for now, since the fix is obvious.  See the bug log.

--no commit message

way of a signal handler) now raise a RuntimeError instead of freezing the
current process.

(instead of PyArg_Parse*() with "es" format and Py_FileSystemDefaultEncoding)

Issue 2690: Add support for slicing and negative indices to range objects (includes precalculation and storage of the range length).

Refer to the tracker issue for the language moratorium implications of this change

* A -b option to start an enhanced browsing session.
* Allow -b and -p options to be used together.
* Specifying port 0 will pick an arbitrary unused socket port.
* A new browse() function to start the new server and browser.
* Show Python version information in the header.
* A *Get* field which takes the same input as the help() function.
* A *Search* field which replaces the Tkinter search box.
* Links to *Module Index*, *Topics*, and *Keywords*.
* Improved source file viewing.
* An HTMLDoc.filelink() method.
* The -g option and the gui() and serve() functions are deprecated.

Partially revert r78719 - it removed a check that is still needed in some cases (i.e. this will allow Michael to add the test.__main__ support that broke the buildbots previously)

The motivation for adding this option is that the the functionality it
provides used to be provided by sgmllib in Python2, and was used by,
for example, BeautifulSoup.  Without this option, the Python3 version
of BeautifulSoup and the many programs that use it are crippled.

The original patch was by 'kxroberto'.  I modified it heavily but kept his
heuristics and test.  I also added additional heuristics to fix #975556,
#1046092, and part of #6191.  This patch should be completely backward
compatible:  the behavior with the default strict=True is unchanged.

Added a few common Popen uses to the tests like we've done for a few other
instances of adding context managers. Eventually the entire test suite
could be converted to use the context manager format.

Simplify the signature for itertools.accumulate() to match numpy.  Handle one item iterable the same way as min()/max().