Py3K warnings are DeprecationWarning by default this was causing -3 to
essentially be a no-op. Now DeprecationWarning is only silenced if -3 is not
used.

Closes issue #7700. Thanks Ezio Melotti and Florent Xicluna for patch help.

argument values in debug mode.  Patch by Victor Stinner.

binascii module.  Backported from py3k by Florent Xicluna, with some
additional tests.

Issue 7632:  fix incorrect rounding for long input strings with values very close to a power of 2.  (See Bug 4 in the tracker discussion.)

Fix off-by-one error introduced in r77483.  I have a test for this, but it currently fails due to a different dtoa.c bug;  I'll add the test once that bug is fixed.

partially before.  Also add a comment describing how this might have to work
with different versions of the interpreter.

even if identical.  Patch by Florent Xicluna (again).

Patch by Brian Curtin.

Patch by Florent Xicluna.

methods of bytes, bytearray and unicode objects by using a common
implementation based on stringlib's fast search.  Patch by Florent Xicluna.

crashes in debug builds, for certain long numeric strings
corresponding to subnormal values.

tree may be mutated when serialized.