(issue869) Add spacer for multiline items This works because single line values now have a height of 15 + spacer (which amounts to the 20 it was before). Multiline columns can have any height as this is generated automatically on breaks to show all text. We now add +5 there so that they have at least some space.

SYMBOLSET
SYMBOL
  NAME 'point'
  TYPE ELLIPSE
  POINTS
    1 1
  END
  FILLED TRUE
END
SYMBOL
  NAME "square"
  TYPE VECTOR
  POINTS
    0 0
    0 1
    1 1
    1 0
    0 0
  END
  FILLED TRUE
END
END