Save and restore default mount options with tune2fs for ext4
Fix a regression introduced by 2d5445466d389b331c9ad1a984c66354415f21ea
A comma as IFS is irrelevant because we need options separated by comma
in one block. (eg : default_mount_options)
Also, it breaks the loop because spaces are used as separator in
disklayout.conf.
Add an option to copy all users and group.
It's usefull in the case we want to restore ACL of all users.
Merge pull request #260 from Arakmar/aclFixes

Better ACLs handling