1999-07-31  Morten Welinder  <terra@diku.dk>

	* src/fn-logical.c (gnumeric_if): Fix case of first argument
 	yielding an error.

	* src/expr.c (expr_dump_tree): Constify.

	* src/func.c (function_iterate_do_value): Fix behaviour of strict
 	functions.

	* src/expr.c (do_expr_tree_invalidate_references): Handle
 	VALUE_BOOLEAN and VALUE_ERROR.
	(eval_expr_real): Make comparisons strict.