This includes a workaround to fix ZSTD detection.

This allows to test the minimal setup of the configuration.

The setup is split, as slaves are now not required.

Some test methods are changed to reflect the reality of instantiation.

This reverts commit bb92b732 because of:

    CMake Error at storage/rocksdb/build_rocksdb.cmake:45 (MESSAGE):
      ZSTD library was not found, but WITH_ROCKSDBZSTD option is ON.  Either set
      WITH_ROCKSDBZSTD to OFF, or make sure ZSTD is installed

without valid fonts, firefox refuses to start

PyPDF2 overwrites `warning.showwarning` and this is already confirmed as a major flaw: https://github.com/mstamy2/PyPDF2/issues/67#issuecomment-34387142

But, this is never applied in PyPDF2.

To fix this issue in ERP5, we will copy the patch to our stack and apply it.

See merge request !746

Use by default latest version

Because we were generating a fontconfig file without the default
configuration, non optimal fonts where selected during substitutions,
for example instead of the very common Arial, we were substituting a
serif font which looks completly different.

See merge request !753

setUpModule is expensive and also the snapshot in case of error would
fail if called more than once

This is a loop invariant.

Is there an option to only ignore KEYEXPIRED ?

Currently, we could just list gettext but for maintainability,
it's easier to compare the list with only python&gcc's buildout.cfg

- pylint and other linters were not working in the new version of python extensions.

- configure URLs for webviews in something compatible with our frontends.

See merge request !755

Because we were generating a fontconfig file without the default
configuration, non optimal fonts where selected during substitutions,
for example instead of the very common Arial, we were substituting a
serif font which looks completely different.

This disable a theia security feature of using a different hostname for
each webview. By defaut, for each webview, thiea generate an unique
hostname that when using vifib frontends would be something like
https://uuid.webview.softinstXXX.host.vifib.net but that's not usable in
our case because we cannot create frontends for a subdomain (also we
don't have certificates for such domain).

Configure THEIA_WEBVIEW_EXTERNAL_ENDPOINT to something less secure, but
working in our environment. This fixes embedded jupyter notebooks and
other web views.