DB entries are not deleted when protection is switched off

Hi,
during my work on the inheritance patch (yes, still to come ;-), it's finished, and currently in extensive testing) I realized that db entries in the protected_nodes table are not deleted when the protected-checkbox is turned off. That's because the was_protected flag is set in nodeapi 'load' (and will be available during delete, view etc.) but is not transferred to form_validate because the form for storing the value is missing.
The patch adds a hidden field for storing the was_protected flag.