Chema bug 6 - Clearing cell immediately beside a blocked span do not respan.
Chema bug 7 - contents of spanning hidden rows/cols still visible.

2000-05-20  Jody Goldberg <jgoldberg@home.com>

	* src/item-grid.c (item_grid_draw) : Do not draw the contents of
	  hidden spanning rows/cols.
	* src/print-cell.c (print_cell_range) : Ditto.

	* src/colrow.c (cb_row_col_visibility) : Be careful not to compare
	  TRUE for equality.

	* src/sheet.c
	(sheet_update_cursor_pos) : warning suppression.
	(sheet_row_col_visible) : Be careful not to compare TRUE for equality.
	(sheet_clear_region) : respan both sides of a singleton row/col.
	  Check for cells to either side even if there is no span,  if we are
	  directly adjacent to a cell it would have no span even if it wanted
	  one.