- Sync our copies of ext2fs Linux headers to current Linux versions.

  Minimize differencies between our ext2fs headers and relevant Linux
  versions by using EXT2_SB macro to access the superblock fields. Most
  of the differencies in access to these fields are now hidden inside
  this macro.
- Rename the s_db_per_group field of ext2fs_sb_info to s_gdb_count
  to reflect the similar change in Linux headers. New name also seem
  to be more appropriate for this field.
- Use proper types for s_first_inode and s_inode_size in-core superblock
  fields. Now they reflec types used in the on-disk superblock version.
- Add support for older filesystem revisions that doesn't have proper
  s_first_ino and s_inode_size fields in the on-disk superblock. In these
  cases predefined values for these fields are used.
- Add simple sanity checks for s_first_inode and s_inode_size correctness.

Reviewed by:	bde (previous version)
MFC after:	2 weeks

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