dirblock.c (ext2fs_read_dir_block2, ext2fs_write_dir_block): New

dirblock.c (ext2fs_read_dir_block2, ext2fs_write_dir_block): New
	functions which take an extra flags argument.  The flag
	EXT2_DIRBLOCK_V2_STRUCT will reverse when the name_len
	field is byte swampped on big-endian machines, since in
	the V2 structure, name_len is a char field which is
	doesn't need to be byte swapped --- except if an
	old-style kernel had byte-swapped the name_len field
	as part of the V1 structure.

Also fixed a bug in debugfs which used ext2_dir_entry_2 without
worrying about the above issue, with the net result that "ls -l"
would print an incorrect file type on big-endian systems.