Implement 64-bit quota format

The following four patches implement new quota format capable of handling quota
limits above 4 TB and inode limits above 2^32 inodes. The code has been
originally developed by Andrew Perepechko <Andrew.Perepechko@Sun.COM>, I've
rewritten the patches to use quota-tree framework. I'm planning to merge the
patches in the next merge window.

									Honza

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