Fix closes Issue12183 - Explain the Symlink copy behavior in shutil.copytree. Patch by Petri Lehtinen.

This prevents tests from failing when run from a Python installed in a
read-only directory.

The changed behavior of sdist in 2.7 broke packaging for projects that
wanted to use a manually-maintained MANIFEST file (instead of having a
MANIFEST.in template and letting distutils generate the MANIFEST).

The fixes that were committed for #8688 (d29399100973 by Tarek and
f7639dcdffc3 by me) did not fix all issues exposed in the bug report,
and also added one problem: the MANIFEST file format gained comments,
but the read_manifest method was not updated to handle (i.e. ignore)
them.  This changeset should fix everything; the tests have been
expanded and I successfully tested with Mercurial, which suffered from
this regression.

I have grouped the versionchanged directives for these bugs in one place
and added micro version numbers to help users know the quirks of the
exact version they’re using.  I also removed a stanza in the docs that
was forgotten in Tarek’s first changeset.

Initial report, thorough diagnosis and patch by John Dennis, further
work on the patch by Stephen Thorne, and a few edits and additions by
me.

Adding Sandro Tosi to Doc/ACKS for this patch and all his work on the
docs mailing list and on the bug tracker.

R. David Murray and I think that it’s more useful to have these files
show up in the output of “hg status”, to let the user know that some
merged file have to be checked before commit.  If you want to ignore
these files in your clones, it’s possible to do so from another ignore
file; see the bug report for directions.

Fix closes Issue11439 - Handle the SVN Keywords in 2.7 by replacing them with a high number so that code relying on them does not break.

Backport of changeset 070dc6e359fb, reindent.py now will use the newline detected in the original file and will report an error if mixed newlines are encountered.

given as a low fd, it gets overwritten.

merge from 3.2 - Fix closes Issue12621 - Fix docstrings of find and rfind methods of bytes/bytearry/unicodeobject.

merge from 3.2 - fix urlopen behavior on sites which do not send (or obsfuscates) Connection: Close header.