What is -dold-relative and why do we need it?

[David Kastrup]

In program-option-scheme.cc we have

  else if (var == ly_symbol2scm ("old-relative"))
    {
      lily_1_8_relative = to_boolean (val);
      /* Needs to be reset for each file that uses this option. */
      lily_1_8_compatibility_used = to_boolean (val);
      val = scm_from_bool (to_boolean (val));
    }

and it is queried in quite a few places.  Lilypond 1.8 seems like a
rather old version to support.

Do we really need to have this around?  Anybody even knows what it does?

-- 
David Kastrup