Suspend security

This is a hidden technical module. It does not add menus, buttons or reports; it changes how Odoo behaves internally when other code asks for it.

• It adds a way to temporarily switch off security checks (access rights and record rules) during a call, so the code can read or write records the current user would normally not be allowed to touch.
• Unlike the standard superuser mode, the operation still runs under the original user, so records created or updated keep that user as their author.
• While security is suspended, access-right checks always pass and record-rule filters return no restriction, meaning all records of the model are visible for that call.
• It also adjusts how user records are looked up so that the special suspended user identifier is handled correctly.

It touches the core base model, the access-rights model ir.model.access, the record-rules model ir.rule and res.users. Because it is a dependency module, its effect is only visible when another installed module uses it; on its own it changes nothing for everyday users.