[hooks/security] silence yams warning (closes #3440707) If the rdef is not final, yams will complain.

[migration/3.18] recover from bad CWSource.in_synchronization default value The addition of this attribute in 3.13.8 had default=False, which made no sense, and was fixed in 3.13.9. However no migration was done so apps that ever saw the 3.13.8 code could still have '' as defaultval for this attribute.

[pkg] prepare 3.18.1

[security] Add comment to check_entity_attributes shortcut Make it clear that it is only an optimization. Related to #3444095.

Disable security hooks for internal sessions Fixes semantic change introduced in 96dba2efd16d where internal sessions started to check attribute permissions. Closes #3444095

[migration/3.18] Explicitly delete constraint on defaultval Make sure the SizeConstraint on defaultval is removed, and avoid more unnecessary commits.

[migration/3.18] Idempotency fixes Try to make partially-upgraded instances migrate properly.

[migration/3.18] Fix NameError

[migration/3.18] Add add_permission relation definitions earlier Otherwise sync_schema_props_perms('defaultval') does not work because the later relation is not in schema.

[migration/3.18] Only commit when we did something Avoids countless confirmation prompts. Closes #3438804.