I have updated the group number type patches with a new name for the type.

Changed type name from ext4_grpnum_t to ext4_group_t.   

The patches have been tested with regular fsx and fsstress tests of the
patch queue.  These patches are based on the current ext4-patch-queue,
and replace the current grpnum_t patches currently in the queue.

Thanks
Avantika

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