* Zope API changes:
  + publish():
    - stdin is now BytesIO rather than StringIO.
    - Returned value of a script is passed to str() in python2, not in python3 anymore.
  + HTTPResponse `body` property is now bytes().
  + OFS.Image.File file parameter is bytes().
  + zope.interface implements() is now @implementer decorator.
  + Python standard logging module recommended instead of zLOG.
* Python3 API changes:
  + builtin reduce() was removed.
  + urlnorm is now available.
  + Use BytesIO rather than StringIO to follow py3 API.
  + hmac.new() requires digestmod argument from Python 3.8.
  + Use six.moves library to handle moved objects from py2 to py3.
  + `modernize -f xrange_six` then slightly adjusted manually to just use range
     where it does not make a significant difference (for example in test).
  + base64.b64encode() now expects bytes().
  + UserDict() interface changed:
    - New parameter in update() and pop().
    - `failobj` setdefault parameter renamed to `default`.
  + ensure_list() on dict.{values,items}() and list(dict) for dict.keys() when
    we really need a list and not an iterable (Python3).
    - Add ensure_list() to RestrictedPython safe_builtins as it's very common usage.
  + Make dict iteration works on both version of Python.
    - Use six.iter{items,values,keys}().
    - has_key() has been removed.
    - Make sure that dict.{items,values,keys}() returns a real list when
    modified (ensure_list()).
  + Comparisons between int and NoneType raises TypeError.
  + No more unbound methods in python3 so use six.get_unbound_function().
  + Exceptions:
    - No longer behave as sequences. Using `args` attribute instead.
    - When an exception has been assigned using `as target`, it is cleared at
      the end of the except clause.
  + file: py2 was returning `str` upon reading, now it returns text strings.
    Also, opening mode is text strings by default.
  + Data strings are bytes().
    - Replace str() by bytes().
  + iterators no longer have next() method, instead there is next() builtin.
  + New ConnectionError exception so rename existing one to not clash.
  + Integer division is now with //.
  + __nonzero__ is now __bool__.
  + apply() does not exist anymore.
  + Deprecated threading.Thread isAlive() has been removed.
  + im_func replaced by __func__.
  + Use six.with_metaclass() to define metaclass in a cross-compatible way with py2 and py3.
  + Only test method can be marked as expectedFailure(), not assert statement anymore.
  + os.path.walk() removed.
Co-Authored-by: Kazuhiko SHIOZAKI <kazuhiko@nexedi.com>
  Arnaud Fontaine <arnaud.fontaine@nexedi.com>
  Carlos Ramos Carreño <carlos.ramos@nexedi.com>
  Emmeline Vouriot <emmeline.vouriot@nexedi.com>

some conversion (TextDocument) depend on the content type, so it's
necessary to first update the content type before trying to convert to
base format

Use scrubHTML() from safe_html module instead.

It was using bytes(), but this seems wrong now.

a17bb910: py2/py3: Make Products code compatible with both python2 and python3.

erp5_syncml: invoke callback method by activity in non split_indexation case as well to make transaction shorter.

Use the removeProperty method.

This executes even if setup() encounters an error and the cleanup hook is added
when opening the file, not later on.

Also, unify makeFileUpload() and makeFilePath() to remove duplicated code.
Co-authored-by: Arnaud Fontaine <arnaud.fontaine@nexedi.com>

See merge request !1979

- {'destination_list': ['person_module/he', 'person_module/me'],
+ {'destination_list': ['person_module/me', 'person_module/he'],

See merge request !1963

   The script is supposed to be called on portal context (or any context) and not on MailevaSOAPConnector, and it should return a MailevaSOAPConnector for a given reference.

    In the implementation where the user cannot directly insert holidays (by an specialised role/implementation) it allow the accountant insert the values more easily. Using a simple action.

    Add simple jump for navigate to the holidays/leave

  This helps to review value on the print out

See merge request !1959

Fix UI tests error introduced by f159d4f2. As it checks for timeout,
simulation finished state cannot be reached anymore.

Fix projection by not making a square map from non square limits (width != depth).
This way rotation does not result anymore in deformed shapes (it was the case until now because proportionality was not respected between width and depth).

Fix typo (cbe50b0f): erp5_accounting_l10n_fr: the French Fiscal Report (FEC) can be generated for different ledgers.

WebSection.getDocumentValueList() returns absolutely all the documents (as catalog brains) reachable by the web section. Then, calling .getUid() on them load all the objects in memory. The number of documents is of the order of hundreds, even on a small ERP5 (web pages, web scripts, etc.).

Limit the documents to retrieve in WebSection_getLatestDiscussionPostList by filtering on the portal_type, and do not load them needlessly in memory.

  This aims to add compatibility with BTreeFolder2 API, even it is not
  required. Since some checkConsistency may call self._cleanup() regardless
  expecting that the folder is a [H]BTreeFolder2 always.

  This was detected when a post upgrade constrant was included to
  portal_categories

The methods used in indexing did not make a difference between the case
where the price is None (ie. price is not set) or where the price is
set to 0 - in both cases this was saved as NULL in stock.total_price
column. This is incorrect, we need to keep the distinction between
these two cases also for inventory calculation.
We had some places where we select IFNULL(stock.total_price, 0) to work
around this, we don't plan to change the existing ones for now, but
while discussing on nexedi/erp5!1974
we concluded that a newly idenfified case of a problem consequence of
these NULL should be handled by fixing the indexation. To benefit from
the fix, impacted instances will have to reindex documents present in
the stock table with stock.total_price is null.

The ad-hoc handling of boolean in protocol 1 was not implemented
correctly and they were serialized as integers (0 for False and 1 for
True), this fixes the export code and re-export everything

With these changes, we are able to install py2 business templates on py3,
but export is slightly different, because we already export using pickle
protocol 3 on py3.

To be able to install py2 business templates, we included heuristics to
guess the str or bytes from business template XML: oids are bytes and
also some strings that do not decode to UTF-8, so that we can install
python2 business templates on py3.

When exporting business templates, we need to build a list of referenced
persistent objects to export them separately in the XML, this is is done
using Unpickler.noload, in a way which does not support pickle protocol
1 on py3 (the persistent ids are None and the assertion in
https://github.com/zopefoundation/ZODB/blob/d698507bb89eeb38c6e655199bc9f54c909dbf4d/src/ZODB/serialize.py#L669
fails), so we need to use pickle protocol 3 on py3.

In the future, we might switch to exporting on protocol 3 on py2 as well
so that we have stable output on both py2 and py3, or maybe we'll do
this only when we stop supporting py2.