seems  that  my last post didn't make it through. That's good
    since  the  diff  itself  didn't  covered  the  renaming   of
    pg_user.h to pg_shadow.h and it's new content.

    Here  it's  again.  The  complete regression test passwd with
    only some  float  diffs.  createuser  and  destroyuser  work.
    pg_shadow cannot be read by ordinary user.