Below is an updated version of the uninitialized block groups patch, 
ported to the end of the patch queue.  There are small changes to the 
previous version:
- consistent format of the group_desc structure with the e2fsprogs patches
- do not verify group_desc checksums if the feature is not enabled

I have tested the patch with the e2fsprogs patches sent by Kalpak, and 
ran fsx.

thanks
Avantika
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