Shared parts speed up compilation time and is becoming the standard in
SlapOS software installations, so it makes sense to use it in our test
nodes, as it also gives one more opportunity to test this feature.

erp5testnode configuration file supports a new shared_part_list option,
that can be set to a \n separated list of paths to use for shared parts,
following the same rules as slapos.core and slapos.recipe.cmmi (ie. the
first ones are read-only and the last one is read-write).

This shared_part_list option will be set in slapos.cfg used to compile
both the "software for testnode" (ie. selenium-runner) and later the
softwares under tests.
The software under tests will also use a local directory for each test
suite to install shared suite.

The directory structure is now:

  srv/
    shared/
      (shared parts to install selenium runner)
    slapos/
      soft/
        (selenium-runner software)
    testnode/
      foo/ # test suite with reference foo
        inst/
          (partitions of tested software)
        shared/
          (shared parts to install tested software)
        soft/
          (tested software)

and in the configuration srv/shared will be set as initial
shared_part_list.

When installing selenium-runner, srv/shared/ is used to write shared
parts. These shared parts are never removed.

When installing software under test, srv/shared/ and
srv/testnode/foo/shared/ are used. If parts are found in srv/shared they
are used, if they are not found, they are installed in
srv/testnode/foo/shared/.

In practice, this should mean that the shared parts installed by
selenium-runner will be reused for all tested softwares and this should
speed up initial installation of these softwares.

Currently, nothing is implemented regarding removal of unused shared
parts, but in our case:
 - srv/testnode/foo/shared/ will be removed when "foo" is removed.
 - srv/shared/ should be used only when installing selenium-runner.

If this starts to use too much disk space, one quick and dirty
workaround could be to destroy the test node instance and re-create it.

Use monaco editor with https://github.com/joe-re/sql-language-server
completion provider bundled in
https://lab.nexedi.com/jerome/monaco-editor-sql-completion-provider
This completion provider is not perfect, but codemirror's one was not so
good either. At least we can use monaco editor.

Also add a quick "copy to cliboard" feature, which copies the table as
html or in markdown format for text.

And also fix Server-Timing header that was an obsolete syntax no longer
supported by chrome.

/reviewed-on nexedi/erp5!1036

The fixes from nexedi/erp5!630
were not enough, exceptions set on days were calendar did not repeat
were also confusing other exceptions after this.

Simplify implementation a lot, instead of keeping track of the next
exception date, start by building a set of all exceptions dates and
use membership of this set as a criterion to skip exceptions.

/reviewed-on nexedi/erp5!1030

Allow python's cryptographically secure pseudorandom number generator for usage in restricted python and use it where it makes sense.

This also change the API of `Person_generatePassword` which no longer allow to control the number of letters and numbers.

/reviewed-on nexedi/erp5!847

This script no longer allow to control the number of letters and digit

Using same method as python 3.6's secrets module and a bit longer token
that what python currently recommends, since we were using very very
long tokens until now (so that it does not look like a "regression")

- use system random
- generate longer password with a larger space

API change in an incompatible way, it's no longer possible to control
the number of alpha and numeric. This was reducing a lot the number of
combinations, so it's better to break so that callers stop generating
too weak passwords.

to make the difference with other fields more visible

If we rename a script used as external validator, we don't have way of detecting that this script might be used, so add to the "static checks" a check that for every field referencing an external validator, this validator can actually be traversed.

/reviewed-on nexedi/erp5!1031

Check that script exists.

Like a real-world user.

__ac_name & __ac_password are only useful to get a cookie, so only use them
when the test is actually expecting a cookie.

One inline javascript snippet less.

ZODB Components: Preparation of erp5_base migration from FS: Fix pylint no-name-in-module on newTempXXX (04b49859).

Change upgrader internal API to use `filter_dict` instead of `filter`
which is a builtin.
Remove a lot of unused code in extensions

/reviewed-on !1014

ZODB Components: Preparation of erp5_base migration from FS: Fix pylint no-name-in-module on newTempXXX (04b49859).

ZODB Components: BusinessTemplate: On migration dialog, ignore source files not available anymore (ex: change branch).

Test should not depend on external websites, we already use erp5.com for
some other tests, so let's use it also for RSS.

/reviewed-on nexedi/erp5!1028

Deleting matrix cells with manage_delObjects is not a good solution, as
this breaks matrix index consistency.
Also, call isBasePricePerSlice rather than introspecting wrapped method
arguments - the only wrapped method is _setBasePricePerSlice anyway !
Also, explicitly trigger SupplyCell_updateSliceBasePrice as it depends on
isBasePricePerSlice value at line level, and it just changed, and cell-level
interaction workflow does not trigger on line changes.
Also, get rid of a trivial local variable.
Also, fix the exception expected from list.index .
Also, raise if multiple quantity criterion are somehow found.

When server replies with a non XML content type feeparser attempt to
parse anyway, but set the bozo flag.

https://universal-feedparser.readthedocs.io/en/latest/#handling-incorrectly-declared-media-types

If parsing fail because the feed is not a valid RSS XML stream,
feedparser fail in other ways, so we can safely ignore this error.

This should repair recent failures with testFeedReaderGadget now that le
monde changed configuration on their website:

     $ curl -sD -  -o /dev/null https://www.lemonde.fr/rss/une.xml | grep Content-Type
     Content-Type: text/html;charset=UTF-8

/reviewed-on nexedi/erp5!1027