Issue #12644: document the '%a' conversion in the old string formatting operations. Patch prepared together with Ezio Melotti

Fix closes Issue11439 Remove the SVN keywords from the code as it is no longer applicable in hg. Patch Contributed by Neil Muller.

to avoid timing-dependent failures.

given as a low fd, it gets overwritten.

when opening a long file.  With Tk 8.5, the first line was hidden.

Fix closes Issue12576 - fix urlopen behavior on sites which do not send (or obsfuscates) Connection: Close header.

link file name.

reindent.py now will use the newline detected in the original file and will report an error if mixed newlines are encountered.

with mmap. Patch by Steffen Daode Nurpmeso.

(not a problem under 3.x)

running in verbose mode (`-v` or `-W`), by using the `--failfast`
(or `-G`) option to regrtest.  This is useful with long test suites
such as test_io or test_subprocess.

module: the piped streams can now be properly read from or written to.

(this was broken due to the 2.x to 3.x transition; communicate() support
is still sketchy)

a read1() method), and add an undocumented *write_through* parameter to
mandate unbuffered writes.

* ftpwrapper now uses reference counting to ensure that the underlying socket
  is closed when the ftpwrapper object is no longer in use
* ftplib.FTP.ntransfercmd() now closes the socket if an error occurs

Initial patch by Victor Stinner.

This is related to a21829180423 as well as #12609 and #12610.

(Patch by Robert Xiao)

  signature.  Without this, architectures where sizeof void* != sizeof int are
  broken.  Patch given by Hallvard B Furuseth.

so that "import DLFCN" and other similar imports work on Linux 3.0.

The RFC doesn't say that they are allowed; apparently many mailers accept
them, but not postfix.  Contributions to this patch were made by Felipe Cruz
and Catalin Iacob.

The changeset also adds additional indirect tests for quoteaddr (null address
and IDNA-encoded address).