Revert "Partial support for more recent versions of ZODB"

This reverts commit 4921db63.

Wrong branch

product/ERP5Type/patches/DemoStorage.py

@@ -16,6 +16,8 @@ from ZODB import DemoStorage as _DemoStorage
 from ZODB.ConflictResolution import ConflictResolvingStorage, ResolvedSerial
 from ZODB.POSException import ConflictError
 
+assert not issubclass(_DemoStorage.DemoStorage, ConflictResolvingStorage)
+
 class DemoStorage(_DemoStorage.DemoStorage, ConflictResolvingStorage):
     ##
     # Implement conflict resolution for DemoStorage
@@ -31,6 +33,4 @@ class DemoStorage(_DemoStorage.DemoStorage, ConflictResolvingStorage):
             self.changes.store(oid, old, rdata, '', transaction)
             return ResolvedSerial
 
-if not issubclass(_DemoStorage.DemoStorage, ConflictResolvingStorage):
-    # BBB: ZODB < 4.3
-    _DemoStorage.DemoStorage = DemoStorage
+_DemoStorage.DemoStorage = DemoStorage

product/ERP5Type/patches/XMLExportImport.py

@@ -59,11 +59,7 @@ class OrderedPickler(Pickler):
         dispatch[PyStringMap] = save_dict
 
 def reorderPickle(jar, p):
-    try:
-        from ZODB._compat import Unpickler, Pickler
-    except ImportError: # BBB: ZODB 3.10
-        from ZODB.ExportImport import Unpickler, Pickler
-    from ZODB.ExportImport import Ghost, persistent_id
+    from ZODB.ExportImport import Ghost, Unpickler, Pickler, StringIO, persistent_id
 
     oids = {}
     storage = jar._storage