Per PEP 600:
```
When this PEP is accepted, the previous manylinux PEPs will receive a final update noting that they are no longer maintained and referring to this PEP.
```
Changes detected by Topy (https://github.com/intgr/topy), all changes
verified by hand, false positives have been omitted.
These range from straight-out misspellings to debatable hyphen placement.
The hyphen changes are supported by grammar manuals of style.
Following popular demands over at manylinux, the `i686` image was updated to use the same `devtoolset-8` as the `x86_64` image.
`devtoolset-8` was not included in the first place because was not available anywhere for `i686`. We're now rebuilding it on COPR to address concerns expressed in the manylinux repo about this software stack inconsistency.
Matching the symbols permitted for x86_64 by GCC_4.3.0 require a limit of GCC_4.5.0 on i686 CentOS 6.
This does create the risk that 32-bit extension modules using `__extendxftf2` may not actually be portable to all 2010 era systems, but most of those other than RHEL/CentOS 6 have already hit the end of their respective support periods.
manylinux1 is getting old enough now to start making things
difficult (specifically around network security), so it's time
for a refresh to a slightly newer baseline.
Matthieu Darbois
Brett Cannon
Marti Raudsepp
赵丰 (Zhao Feng)
Esun Kim
Bruce Merry
Thomas Kluyver
Min ho Kim
Anthony Sottile
Dmitry Alimov
Nick Coghlan
Mark Williams
Thomas Kluyver