mod_rest: Fix name of entry in error registry for unauth 'from' Wow was this a pain to track down or what? Symptoms: An error with condition: undefined-condition. No further details.

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```