Remove grouped_slice per IN_MAX

The usage of ``grouped_slice`` without size is deprecated since `=
ANY(ARRAY[%s])` is used for PostgreSQL and SQLite is used only for tests.

The ``Database.IN_MAX`` is replaced by ``backend.MAX_QUERY_PARAMS`` which is a
more accurate limit of the backend.
The SQLite limits is indeed SQLITE_MAX_EXPR_DEPTH so we use a empirical value.

trytond-gis/trytond_gis/postgis/__init__.py

@@ -1,17 +1,18 @@
 # This file is part of trytond_gis.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.backend.postgresql.database import (
-    DatabaseDataError, DatabaseIntegrityError, DatabaseOperationalError,
-    DatabaseTimeoutError)
+from trytond.backend.postgresql import (
+    MAX_QUERY_PARAMS, DatabaseDataError, DatabaseIntegrityError,
+    DatabaseOperationalError, DatabaseTimeoutError)
 
 from .database import Database
 from .table import TableHandler
 
 __all__ = [
     Database,
-    DatabaseIntegrityError,
     DatabaseDataError,
+    DatabaseIntegrityError,
     DatabaseOperationalError,
     DatabaseTimeoutError,
+    MAX_QUERY_PARAMS,
     TableHandler,
     ]