Document/WebSite&erp5_web: introduce web site language priority convention to fix report language issue on renderjs ui

1. [Browser is supposed to send something between 0 and 1]( https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language )

2. [Localizer will set 2 or 3 for cases where user selected language]( https://lab.nexedi.com/nexedi/erp5/blob/08be2f8cc936fbdc3d5bafb4355c3a475198abc1/product/Localizer/Localizer.py#L149-172 )

3. all print scripts seems set selected language priority to 10

so here we introduce a convention that site language priority should be 8(>3 and < 10) to fix report language issue

Fallback to modification_date if a document does not have an effective_date.

Indexation activities may spawn further activities, and for_each_activity
expects the number of activities after a test to be zero.

System user should be more reliable than whatever user has ownership of
catalog tool (which may have its account closed or its roles changed).

CMFActivity: Fix ActivityRuntimeEnvironment.getPriority when activity was not loaded from an SQL queue.

This happens when activities are being flushed from the ActivityBuffer
directly, without being inserted into and then loaded from the SQL queue.
It is unclear whether there are uses of this pattern besides
testCMFActivity, but it is easy enough to fix.

Checking activity presence/absence is not enough: it risks both false
negatives and false positives. Instead, manually poison the catalog's
content and check which value we retrieve after executing spawned
activities (if any).

it's not finished, rework if need

- Remove trailing whitespaces
- Follow guidelines
- Fixup types

Also, use it in Products.ERP5Type.tests.ERP5TypeTestCase.

The only use 'my_' has above 'your_' is to provide a default field value
without needing a TALES expression. This only gets applied based on the
field ID in the form being rendered. Field libraries are never meant to be
rendered, so using 'my_' is always (if harmless) pointless. What really
matters for the field naming convention (which exist to avoid collisions
with form properties) is that *some* prefix is used, be it 'my_' or
'your_'.
So update this check rule to tolerate 'your_' prefixes in addition to
'my_'.
Also, use 'not any([...])' instead of 'not 1 in [...]'.

I guess this is the intention of the unnecessary pair or parentheses.

"Certificate Authority" is a bit long, especially as it is often followed
by some other word ("Certificate", ...).

Abbreviations must be upper-case.

The precise number of entries in a bucket depend on an estimation of the
size of a pickle. The pickled data contains DateTime objects, making an
equality test brittle:
- DateTime's timezones are stored as strings (ex: 'GMT') whose length
  depend on Zope's timezone, which is variable
- DateTime's time is stored as a floating-point value represented as a
  string whose length depends on the number of units and decimals are
  necessary to represent its value, both being variable (one based on when
  the test was run, the other based on clock precision and exact test
  execution timing)
Instead, restore the originally-considered-acceptable boundary (24) and
verify that the generated value is greater or equal to it.
If 24 is considered too small to be acceptable, then it is a decision
independent from the present change.

See merge request nexedi/erp5!1553

Some combinations of periodicity, for example repeat every first week
of the year and every month February are impossible (because the first
week of the year is always in January) and such configurations caused
infinite loops or probably overflow if we wait long enough.

The algorithm being to try the next day until all constraints are met,
it is not guaranteed to terminate.

To make sure the algorithm terminate, we rely on the fact that calendars
repeat after some time, so if after a few years we did not find a
matching combination, we can stop retrying.

according to https://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week

> Each leap year repeats once every 28 years, and every common year
> repeats once every 6 years and twice every 11 years.

so trying for 28 years should be enough to see all combinations

In ZODB 5, with commit b6ac40f1 (Uses an unwrapped transaction manager,
2018-10-14) the transaction is bound to the thread opening the
connection.
The previous pattern of opening transaction in the main thread and
passing the already-open connection to the working thread caused the
working thread connection to be managed by the main thread connection
and in ZODB 5 cause the test to block.

Fix this by passing a connection factory method and opening
connection in working thread.
Also simplify closing of connection by using a closing context manager.

With upcoming ZODB 5, oids (used as persistent references in pickles)
are no longer str as it use to be with ZODB 4, but instances of
zodbpickle.binary, which with zodbpickle 1 are a subclass of str on
python2.

OrderedPickler was a subclass of pickle.Pickler, the pickler from standard
library, but this pickler was not able to use a str subclass for persistent
references, when pickles are loaded with noload method, persistent_load
is called with `None` instead of the actual string subclass instance.
This was problematic in the XMLExportImport handling of business templates,
because ZODB.serialize.referencesf was unable to find persistent references.
The error was:

    ZODB-5.6.0-py2.7.egg/ZODB/serialize.py", line 664, in referencesf
        assert isinstance(reference, list)
    AssertionError

because the reference was None.

zodbpickle 2 changed to make zodbpickle.binary implemented in C, which
was failing earlier, because pickle.Pickle can not pickle these objects,
failing in an error like this:

    lib/python2.7/copy_reg.py", line 70, in _reduce_ex
        raise TypeError, "can't pickle %s objects" % base.__name__
    TypeError: can't pickle binary objects

This change also simplify our own implementation, by dropping jython
support and calling save_dict on the super class instead of copying the
implementation.

Further references:

- minimal script to reproduce the issues:

```python
from __future__ import print_function
import io
import pickle

import zodbpickle
import zodbpickle.pickle
import zodbpickle.fastpickle

class ExternalObject(object):
  def __init__(self, oid):
    self.oid = oid

def persistent_id(obj):
  if isinstance(obj, ExternalObject):
    return obj.oid

def persistent_load(persid):
  print('persistent_load called with persid', repr(persid))

o = ExternalObject(oid=zodbpickle.binary("binary persid"))

for pickler_class in pickle.Pickler, zodbpickle.pickle.Pickler:

  f = io.BytesIO()
  p = pickler_class(f, 1)
  p.persistent_id = persistent_id
  p.dump(o)

  print('dump with pickler %s:\n  %r' % (pickler_class, f.getvalue()))

  # ZODB uses this unpickler
  up = zodbpickle.fastpickle.Unpickler(io.BytesIO(f.getvalue()))
  up.persistent_load = persistent_load
  up.noload()
```

```console
$ python2 repro.py # with zodbpickle 1
dump with pickler pickle.Pickler:
  'ccopy_reg\n_reconstructor\nq\x00(czodbpickle\nbinary\nq\x01c__builtin__\nstr\nq\x02U\rbinary persidq\x03tq\x04Rq\x05Q.'
persistent_load called with persid None
dump with pickler zodbpickle.pickle_2.Pickler:
  'U\rbinary persidq\x00Q.'
persistent_load called with persid 'binary persid'
```

```console
$ python2 repro.py # with zodbpickle 2
Traceback (most recent call last):
  File "repro.py", line 45, in <module>
    p.dump(o)
  File ".../lib/python2.7/pickle.py", line 224, in dump
    self.save(obj)
  File ".../lib/python2.7/pickle.py", line 273, in save
    self.save_pers(pid)
  File ".../lib/python2.7/pickle.py", line 340, in save_pers
    self.save(pid)
  File ".../lib/python2.7/pickle.py", line 306, in save
    rv = reduce(self.proto)
  File ".../lib/python2.7/copy_reg.py", line 70, in _reduce_ex
    raise TypeError, "can't pickle %s objects" % base.__name__
TypeError: can't pickle binary objects
```

* ZODB change starting to use zodbpickle.binary instead of str:
12ee41c4 (-ZODB now uses pickle protocol 3 for both Python 2 and Python 3., 2018-03-26)
Since of 5.4.0 release

* zodbpickle change starting to use C objects for zodbpickle.binary:
bbef98c (Implement zodbpickle.binary in C for Py27., 2019-11-12)
Since of 2.0.0 release

Now that we fail immediately in case of failure, the deadline can be
safely increased, because it only protects against kind of infinite loops.

Increasing the delay should fix RuntimeError: tic is looping forever
errors with only messages in status -1, that we sometimes saw on testnodes.

Now that tic retries until the deadline is reached or all messages has
failed, it can lead to situations where developer have to wait until the
deadline, when a message failed but other messages (typically scheduled
to run after the failed message) were still running.

By stopping as soon as one message is failed, in this scenario the
developer does not need to wait until the deadline.

1. don't manipulate data base to avoid resend to web service in case of data base conflict
2. use existing property
3. change alarm frequency

In our use, waitress is embedded in Zope and not as a proxy, so it has no
legitimacy emitting Via headers.
While this process often is the origin server, Server response header is
optional and should be left to the lower layers to control, and not
auto-generated by waitress.

See merge request nexedi/erp5!1500

1. display employee number
2. add preview
3. add parameter to send to maileva

maileva