[backport to 2.7] - issue8519 - Reference termios and ioctl manual pages in the library documentation.

that support os.fork.

take a rediculious amount of time to run, fail or provide little use
to the profile feedback.  (similar to what is already done in 3.5 and
by major Linux distro builds own profiling runs)

enable link time optimizations at build time during a make profile-opt.
Some compilers and toolchains are known to not produce stable code when
using LTO, be sure to test things thoroughly before relying on it.
It can provide a few % speed up over profile-opt alone.

verification and patch by Emily Morehouse.

I wonder why I keep forgetting 2.7 :P

Patch by Bryce Verdier.

Patch contributed by Nathan Harold.

issue26083: Avoid duplicate error message string from a subprocess exec failure.Avoid a duplicate error message string from a subprocess exec failure.
:P

Patch by Anish Shah and Aatish Neupane.

Based on documentation by AM Kuchling.

Most fixes to Doc/ and Lib/ directories by Ville Skyttä.

Such fonts on Linux prevented the configuration dialog from opening.