MetronomeMark at top + above staff groups - no luck

[anders . vinjar]

Hi, i see this issue has been raised many times earlier.  However, the
suggested solutions i've found don't seem to work.

I need the MetronomeMarks placed at two places: on top of score and
above a StaffGroup (actually a PianoStaff) further down.

In the score included below i've tried all combinations of placing
"Metronome_mark_engraver" and "Staff_collecting_engraver" in Score,
Staff and StaffGroup wo. luck - the marks either end up all on top of
score, or above each staff, or a combination of these two.

Heres an illustration of what i want, perhaps someone can point me to
the right way:


     Tmpo1                  Tmpo2
 ins1|------|-------|-------|--------|

 ins2|------|-------|-------|--------|

     Tmpo1                  Tmpo2
 pno |------|-------|-------|--------|
     |------|-------|-------|--------|

Any clues?

Cheers,

-anders

rehearsal_mark_in_Frenched_score.ly
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