2000-06-04  Jody Goldberg <jgoldberg@home.com>

	* src/sheet.c (sheet_cell_add_to_hash) : Set the CELL_IN_SHEET_LIST
	  flag.
	(sheet_cell_remove_from_hash) : Clear the CELL_IN_SHEET_LIST flag.
	(cb_remove_allcells) : Ditto.
	(sheet_cell_formula_link) : Set the CELL_IN_EXPR_LIST flag.
	(sheet_cell_formula_unlink) : Clear the CELL_IN_EXPR_LIST flag.
	(sheet_formulas_unlink) : Ditto.

	* src/clipboard.c (paste_cell_flags) : Take some additional arguments
	  so that pasted cells can potentially have their references made
	  invariant, this is for sorting.
	(clipboard_paste_region) : Pass the additional offsets when
	  PASTE_EXPR_RELOCATE is specified.
	(append_cell_closure_t) : Delete this type.  Move the origin cell info
	  into CellRegion.

	* src/cell.c (cell_copy) : Clear the sheet and associated flags for
	  the copied cell.  This avoids accidentally realizing comments that
	  become undeletable.
	(cell_relocate) : Remove the unlink flag now that we have the
	  additional cell_flags.