code: public CellConstraints xy(int col, int row,
              Alignment colAlign, Alignment rowAlign) {
          return xywh(col, row, 1, 1, colAlign, rowAlign);
      }
docs: Sets the column and row origins; sets width and height to 1; set horizontal and vertical
  alignment using the specified objects.<p>
  
  <strong>Examples:</strong><pre>
  cc.xy(1, 3, CellConstraints.LEFT,   CellConstraints.BOTTOM);
  cc.xy(1, 3, CellConstraints.CENTER, CellConstraints.FILL);
  </pre>
  
  @param col the new column index
  @param row the new row index
  @param colAlign horizontal component alignment
  @param rowAlign vertical component alignment
  @return this