--force with --check-anomaly makes monitor.runpromise execute the promise
unconditionally, even for testless ones.

Update versions and tweak a bit python language server config.

After some investigation, I understood that completions where slow for us because jedi add some [buildout support](https://github.com/davidhalter/jedi/blob/cef769ecd8b3a50cd0784d8660b123f4bf0eaec2/jedi/evaluate/sys_path.py#L132-L137) which walks up directories to find a `buildout.cfg` and inspects the corresponding scripts in `bin` to find python package paths. On web runner I have 98 scripts in `~/bin/`, each of them adding between 30 and 50 entries to `sys.path`.

A quick workaround is to create an empty `buildout.cfg` in the current directory or a parent directory before editing python code.

/reviewed-on !509

/reviewed-on !539

Building Bison 3.3.2 now requires autoconf.

fixup for af247599: Put automake
in $PATH instead of creating its own environment variable.

Needed for nexedi/kedifa!2

/reviewed-on nexedi/slapos!537

otherwise hdf5.so cannot be found on compilation of h5py

more-itertools is a hidden dependency, not managed by buildout.
It has dropped support for python2 after version 5.0.0

/cc @tomo @jm

/reviewed-on !536

This partition contains no data worthy of backup:
- only in-transit emails appear
- logging is (sadly) not local to the partition

- Use `xz-utils` component for log file compression
- Fix some stacks and software releases to use the logrotate stack instead of re-creating it:
  - `software/caddy-frontend`
  - `stack/resilient`

/reviewed-on nexedi/slapos!508

Use xz instead of gzip.
Also put the cron script in etc/service instead of etc/run (to have the
"cron-on-watch" process)

Building Bison 3.3.2 now requires automake.

OpenVPN fails to build on Debian testing because
net-tools is no longer provided by default.

/reviewed-on nexedi/slapos!534

in apache frontend, we have been using:

```
LogFormat "%h %l %{REMOTE_USER}i %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %D" combined
```

The %l is (from mod_log_config docs): Remote logname (from identd, if
supplied). This will return a dash unless mod_ident is present and
IdentityCheck is set On.

In the case of apache frontend, it was always a - . This is missing in
caddy frontend and our existing log processing tools (apachedex) cannot
be used on frontend logs since we switched to Caddy.

/reviewed-on nexedi/slapos!530

dict in headers is smallcase, so it was never working in reality.