[hooks] fix extra_props handling on python3 The json module expects str, not bytes, so we need to do the decoding.

[py3k/ldapparser] avoid confusion between unicode and bytes - ldap3 dicts contain unicode strings - extid must be bytes

[pkg] use correct lgdb version for tz rework Related to #4848923.

pep8 bits

[server] improve TZDatetime support by depending on logilab-database 1.15.0 including https://www.logilab.org/ticket/1485893, we can now keep the tzinfo attribute on datetime objects for TZDatetime attributes, so one knows that this is a tz-aware datetime. To easily make it work with backends that have no tz support, we keep converting tz-aware datetime objects into utc naive datetime objects before sending them to the database.

[schema] Use TZDatetime for creation_date and modification_date No work has been done for form fields/widgets since creation_date / modification_date are by default not editable through the default UI. One may want to add such feature at some point. Time will be displayed as UTC, let the end-application decide otherwise by customizing the tzdatetime printer if desired. Closes #4848923

[server] fix SQLite patch to ensure TZDatetime are properly typed NB: at this point, the TZ info is completely ignored. It will be properly handled in later commits.

[server] fix name and add docstring to connection initialization functions