Hand-made merge based on the following commit.

commit eb517ef0
Author: Yusei Tahara <yusei@nexedi.com>
Date:   Fri Feb 22 15:11:15 2019 +0900

    Add faketime for tests.

  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 !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

should fix crypt issues with python 3.9

See merge request !1320