Splitting project quota support from group quota support

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< arekm> btw. is separating projquota from group quota possible without changing on disk format?
< hch> arekm: no
< hch> it might actually be not too hard to do
< hch> but it would be a change to the disk format
< hch> not a bad one, runtime conversion should be quite easily doable
< hch> superblock would need a new field for the third quota inode
< hch> you'd need the actual third quota inode
< hch> not sure if any other structures reference quota bits
< hch> the in-core change would be much larger
< hch> I think this is an easy enough task for a new contributor
< hch> I'd be happy to mentor anyone sufficiently skilled to do it
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