Going from ZODB 5.6.0 to 5.8.0:

- removes leftovers of pre-MVCC read conflicts,
- relaxes assertion in tests that relate to NEO,
- brings up interface requirements in line with Wendelin.core 2 and WCFS,
- optimizes IO in fsrefs,
- fixes fsdump to match fsstats,
- provides new tests that exercise potential concurrency issues in
  storage implementations more thoroughly,
- provides other fixes and improvements.

Please see https://github.com/zopefoundation/ZODB/compare/5.6.0...5.8.0 and
https://pypi.org/project/ZODB/5.8.0/ for details.

By inspecting current configuration stored in .data-disk-amount of the
partition configuration directory extend the conflict protection to really
observed configurations.

Adapt the README to follow real messages and explain a bit more the situation.

Patch nexedi/slapos@15e26abd explicitly declared
go version 1.17 for the 'helloworld' SR.

This was done at a time when we already had [golang1.17] in component/golang,
but the default was still go1.16. The explicit declaration allowed the 'helloworld' SR
to already switch to the newest go version.

Since patch nexedi/slapos@d32524c3
we use go1.18 as our default version. In order to allow 'helloworld' to use our newest
SlapOS supported go version, it's therefore sufficient nowadays to simply remove the
explicit declaration.

/reviewed-on nexedi/slapos!1330
/reviewed-by @kirr

See merge request !1329

Reuse stack and drop overcomplicated rsyslogd configuration.

A stack to share common configuration aspects.

See merge request nexedi/slapos!1328

  INFO (echo "# Do not edit -- this file documents how Postfix was built for your machine."; /bin/sh makedefs) >makedefs.tmp
  INFO ATTENTION:
  INFO ATTENTION: Unknown system type: Linux 6.1.6-arch1-3
  INFO ATTENTION:
  INFO make: *** [Makefile.in:33: Makefiles] Error 1
  INFO make: *** [Makefile:22: makefiles] Error 2

See merge request nexedi/slapos!1312

software/monitor: Clean-up 'default/base' monitor

forgot stack directory in 61ad458c

Add a webmanifest and a service worker to support "Add to home screen"


![image](/uploads/0ce9c6abdbe27291dd7fc8210d823c40/image.png)


Application name in this screenshot is "Theia SlapOS theia" because I requested with instance name "theia".

See merge request nexedi/slapos!1323

There was wrong configuration of alpn h3, which defined globally, but
overridden by slave specific configuration. Thanks to this fix, on a node
which is QUIC enabled, the QUIC possible slaves are working well.

Unfortunately real world deployment is using iptables, which is not consistent
regarding the port advertised to in case of UDP, thus it's required to force
the user to set the "virtual" listening port.

Required components are added, and in order to be really on the bleeding edge
for experimental and fresh features pick up recent curl version.

Allow to use --alt-svc for the http3 flavour, as it is quite imporant switch
for HTTP3 feature.

Based on https://curl.se/docs/http3.html

Add a webmanifest and a service worker for to support "Add to home screen"

When the backup script takes more than one second the file name is not
20500101000000.sql.gz

This brings support for 2020-12 schemas. The python2 version is
left unchanged