Backport of r67266

Backport r66804: #1415508 from Rocky Bernstein: add docstrings for enable_interspersed_args(), disable_interspersed_args()

and then remove it. Written by Guilherme Polo (gpolo). Backport of r67082.

does not return an iterator for the 4th and 5th items.
(sequence-like and mapping-like state)

Backport of r67049.

snv rev 59943 and 59946.

module.

garbage collection of a Profiler object.

For example:
   "".count("xxxx", sys.maxint, 0)

Backport of r66631.

Reviewed by Fredrik Lundh and Skip Montanaro.

Backport from trunk.

 - Issue #3678: Correctly pass LDFLAGS and LDLAST to the linker on shared
   library targets in the Makefile.

Reviewed by Benjamin Peterson.

 - Issue #1204: The configure script now tests for additional libraries
   that may be required when linking against readline.  This fixes issues
   with x86_64 builds on some platforms (a few Linux flavors and OpenBSD).

the fix for issue 874900 to fix the use of the threading module in a
post-fork python process.  A NEWS entry for this already exists with
the previous Lib/threading commit for this bug.

Reviewed Amaury Forgeot d'Arc (Backport of r66213)

a unicode argument.

Backport of r66119

 issue3715: docstring representation of hex escaped string needs to be double
 escaped.

Backport from trunk r65971.

Also fixes rgbimg module (just before it is removed from 2.6).