[dev] New prefs_init hook

[Jan Schneider]

IIUC the new prefs_init hook is called *always* after logging in. This  
is a change from the old behavior where the preference hooks were only  
called if a value hasn't been set yet.

1) is this the intended behavior?
2) if yes, why?
3) who is one supposed to determine if the value passed to the hook is  
the user's value or the pref's default value?

Jan.

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