mke2fs,tune2fs: Enable huge_file, dir_nlink, and extra_isize features

Also change mke2fs.conf to enable huge_file,dir_nlink,extra_isize, and
uninit_bg by default for ext4 filesystems, and enable extra_isize in
the library as well.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
4 files changed