(issue1754) Increase m index after adding an interpolated result. At this point we have added a result for this km of the minuend by interpolating the corresponding s value. So we can take a look at the next KM. Not doing this could lead to duplicated results in this calculation.

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