void shift_cells(int type, int arg, int delta);
void shift_cells_up(int deltarows, int deltacols);
void shift_cells_down(int deltarows, int deltacols);
void shift_cells_left(int deltarows, int deltacols);
void shift_cells_right(int deltarows, int deltacols);
void shift_range(int delta_rows, int delta_cols, int tlrow, int tlcol, int brrow, int brcol);