Extend stock report dialog to allow choosing a (simple) valuation method

![stock report dialog screenshot](/uploads/2e0fa7c420954c3f84260605b3a6930e/image.png)

which be displayed in a new column, showing the inventory value for each line

See merge request nexedi/erp5!1203

Changing the language and browsing to another web section require to fully refresh the page.

The default value of the field was calling Base_getEditorFieldPreferredTextEditor and returned the preferred text editor, because this script assumes the content type to be text/html by default

Ever since the introduction of X-Balancer-Current-Server in SlapOS
haproxy configuration in:
  commit c7f104fbf1f5948928f5545286afbb94fc39102b
  Author: Cédric Le Ninivin <cedric.leninivin@tiolive.com>
  Date:   Tue May 26 13:27:33 2015 +0200

      erp5_cluster: leave ERP5 set the haproxy cookie

the balancer will overwrite this cookie's value, so do not compare it
to our name: balancer may be calling us a name completely unrelated to
the value getCurrentNode returns.
So simplify this function's logic to only do what the docstring says:
decide when to set and when to unset the balancer cookie, and let the
balancer decide the value.
This resolves cases where Zope would set the cookie over and over on
every request when getCurrentNode and balancer disagree on its value.

- use environment variables to pass SLAPOS_TEST_LOG_DIRECTORY and SLAPOS_TEST_SHARED_PART_LIST, as discussed on nxdtest!2
- Fix #20200514-218C705 - [testnode] frontend for log access

See merge request !1304

This change to unconditionally create products, to make it more clear
that it's OK for test methods to change the products configuration because
they are reset at the beginning of each tests (they have always been removed
during tear down)

This is used and should not be disabled.

There was an error when clicking this dialog, fix that error instead.

See merge request !1301

In ERP5JS when redirecting we can use `portal_status_level` to control the appearance of the notification.

This updates the cases when user action could not be performed to redirect with an error level, so that notification appears in orange, not in green (in ERP5JS - in erp5_xhtml_style this has no effect).

accounting, base, trade were updated

See merge request !1303

See merge request !1302

so that installed objects are owned by System Processes and we can have faster ownership checking for proxy role scripts.

Portal is the Skinnable object, skin magic belongs there.

Also, modernise it a bit.

testnode use to publish the URL of logs so that Nexedi ERP5 can
display link to "view logs". This URL was an IPv6 URL on a certificate
which does not validate.

Now testnode software release request a shared frontend for these
logs and generate a config file with log_frontend_url set.

testnode now advertise the URL of log using the log frontend url
from config.

Also simplify frontend_url key to manage it using the same way.

SLAPOS_TEST_LOG_DIRECTORY and SLAPOS_TEST_SHARED_PART_LIST have been
introduced recently, they are passed to runTestSuite using the usual
way of running runTestSuite once with --help to inspect supported
arguments and passing the argument only if runTestSuite supports them,
but these arguments are not necessarily heavy to compute and are always
known (unlike for example firefox path which is only known if seleniumrunner
extra software was installed), so simplify all this by passing the
parameters are environment variables.

because title is acquire from id, we want to edit title first for the
case where we change ID, otherwise saving would save the old ID as
title.

 * don't set "hide rows on no search criterion", this should not display
too much and search is broken.
 * use preference to get number of lines

This action was working fine the first time displayed, but clicking
again on "View Diff" button was causing an IndexError: list index out of range
when used on one document.

This was because in this case list_selection_name exists in REQUEST, but
is an empty string. Instead of checking that this selection name is not
None to detect if we are in module mode or in document mode, check that
its true-ish to also tolerate an empty string.

This reverts commit 06a7737f.

Base_getDialogSectionCategoryItemList was supporting the case of
users from zodb_users plugin, but not the case of ERP5 users with
roles set from zodb_roles.

It's a more and more common case to make manager users using a
"normal" ERP5 user as person (so that we can reset password etc)
and to give Manager role by zodb_roles, but this was not supported
by this script.

Now that we properly detect 0 tests as errors/UNKNOWN, this test was reported
as UNKNOWN state. Run the tests, but as expectedFailure since they have not
been updated since b4b5bcf8.

See merge request !1259