BFS doesn't handle ".." correctly, so convert it to fshelp to reuse the logic.

	Just "packed" doesn't always pack the way we expect.

	bfs.mod size by 556 resp 740 bytes (288 resp 334 compressed).
	* include/grub/types.h (grub_unaligned_uint64_t): New type.

	* include/grub/disk.h (grub_disk_read_hook_t): New type.
	(struct grub_disk): Add read_hook_data member.
	* include/grub/file.h (struct grub_file): Likewise.
	* include/grub/fshelp.h (grub_fshelp_read_file): Add read_hook_data
	argument.

	Update all callers.

* include/grub/fs.h (grub_fs_dir_hook_t): New type.
(struct grub_fs.dir): Add hook_data argument.

Update all implementations and callers.

	(grub_bfs_dir): Likewise.

	match in inner node.

	* grub-core/fs/ext2.c (grub_ext2_mount): Likewise.
	* grub-core/fs/hfs.c (grub_hfs_mount): Likewise.
	* grub-core/fs/hfsplus.c (grub_hfsplus_mount): Likewise.
	* grub-core/fs/jfs.c (grub_jfs_mount): Likewise.
	* grub-core/fs/minix.c (grub_minix_mount): Likewise.
	* grub-core/fs/ntfs.c (grub_ntfs_mount): Likewise.
	* grub-core/fs/romfs.c (grub_romfs_mount): Likewise.
	* grub-core/fs/xfs.c (grub_xfs_mount): Likewise.

	filesystems.

	characters.

	* grub-core/fs/bfs.c (bfs_strcmp): New function.
	(find_in_b_tree): Use standard bsearch + btree algorithm.

	warning.

	Fix source dir check.

	on it.

	* Makefile.util.def (libgrubmods): Add afs.c.
	* grub-core/Makefile.core.def (afs): New module
	* grub-core/fs/afs.c: New file.
	* grub-core/fs/bfs.c [MODE_AFS]: Adapt for AFS.

	* grub-core/fs/bfs.c: New file.
	* Makefile.util.def (libgrubmods): Add bfs.c.
	* grub-core/Makefile.core.def (bfs): New module.