spacing overrides break melismata

[Keith OHara]

If anyone changes the vertical spacing of lyrics using the method below, 
the problem reported in issue 1120 comes back.  Patch at 
http://codereview.appspot.com/4095041/

<< 
  \context Voice = "v" { c' c' c' c' c'1 }
  \new Lyrics \with { 
  \override VerticalAxisGroup
    #'nonstaff-relatedstaff-spacing = #'((basic-distance . 7)) 
  } \lyricsto "v" {
    \lyricmode { ooooooo __ _ _ _  a } 
} >>

evil2.png
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