/**
  * Called when a column is inserted on the specified sheet.  Tells
  * the formula  parser to update all of its cell references beyond this
  * column
  *
  * @param sheetIndex the sheet on which the column was removed
  * @param col the column number which was removed
  * @param currentSheet TRUE if this formula is on the sheet in which the
  * column was inserted, FALSE otherwise
  */
 public virtual void columnRemoved(int sheetIndex, int col, bool currentSheet)
 {
     root.columnRemoved(sheetIndex, col, currentSheet);
 }