2002-12-13  Morten Welinder  <terra@diku.dk>

	* src/parse-util.h (struct _GnmExprConventions): New members
	expr_name_handler and output_sheet_name_sep.

	* src/expr.c (do_expr_as_string): Use new expr_name_handler is
	conventions.

	* src/parse-util.c (def_expr_name_handler): New function, mostly
	extracted from do_expr_as_string.
	(gnm_expr_conventions_new): Attach def_expr_name_handler.