2001-05-25  Jody Goldberg <jgoldberg@home.com>

	* src/value.c (value_diff) : new routine.  This looks ugly.  We should
	  be able to avoid replicating this code.

	* src/cell.c (cell_eval_content) : support iteration.

	* src/format.c (render_number) : make the buffer big enough.
	  The assumtion that mantissa and exp are both maxed should leave
	  enough room for thousand separators.