* grub-core/fs/affs.c (grub_affs_bblock): Replace flags with version.
(GRUB_AFFS_FLAG_FFS): Removed.
(GRUB_AFFS_SYMLINK_SIZE): Likewise.
(GRUB_AFFS_FILETYPE_DIR): Make positive and unsigned.
(GRUB_AFFS_FILETYPE_DIR), (GRUB_AFFS_FILETYPE_REG): Fix a mix-up.
(grub_fshelp_node): Make block 32-bit.
Add block_cache and last_block_cache.
(grub_affs_read_block): Fill and use block cache.
(grub_affs_read_file): Removed.
(grub_affs_mount): Zero-fill node. Fix version check. Don't reread
boot block.
(grub_affs_read_symlink): Fix symlink size. Add a \0 at the end for
safety.
(grub_affs_iterate_dir): Use more appropriate types. Zero-fill allocated
space.
(grub_affs_close): Free block cache.
(grub_affs_read): Use grub_fshelp_read_file directly.
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