[K12OSN] Permissions for students and teachers

[Almquist Burke]

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>  The only tricky part is that files created by teachers in a  
> student's directory may not be writable by the student unless the  
> teacher is careful to change groups before creating it or to change  
> group ownership.

The way to fix this is to make all home folders setGID. That way any  
files created in that folder will have their group set to that  
folders group by default.


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