Drop Transaction extension & allow use of transaction.doom from Restricted Python

product/ERP5/Extensions/Transaction.py

-import transaction
-
-def abort_transaction():
-    # FIXME: aborting a transaction means it could be commited later on. The
-    # transaction should be doom()ed instead, but transaction.doom() is not
-    # available on Zope 2.8. We should provide our own doom() implementation
-    # which raises an exception on pre-commit-hook, which does exist
-    # in Zope 2.8
-    transaction.abort()

product/ERP5Type/patches/Restricted.py

@@ -228,3 +228,5 @@ def guarded_import(mname, globals=None, locals=None, fromlist=None,
       fromlist = ['__name__']
   return orig_guarded_import(mname, globals, locals, fromlist, level)
 safe_builtins['__import__'] = guarded_import
+
+ModuleSecurityInfo('transaction').declarePublic('doom')