illumos gate

The initial symptom is that the zfs-related home directory functionality has been added to the user{add,mod,del} man pages but is missing from the corresponding role{add,mod,del} man pages. The functionality is present in both sets of commands, so the man pages should reflect that.

Looking closer, all the {user,role,group,proj}{add,mod,del} man pages could do with cleaning up and being harmonised.