2001-05-29  Morten Welinder  <terra@diku.dk>

	* fn-information.c (gnumeric_cell, gnumeric_info, gnumeric_error,
 	gnumeric_n): Use value_peek_string.

	* fn-financial.c (gnumeric_coupdaybs, gnumeric_coupdays,
 	gnumeric_coupncd, gnumeric_coupnum): Remove mysterious and
 	unnecessary references to VALUE_ERROR.
	(gnumeric_db): Improve error checking.

	* fn-eng.c (gnumeric_complex): Fix using value_peek_string.
	(gnumeric_convert): Get rid of one_C_to_K and introduce
 	C_K_offset.  Fix using value_peek_string.
	(get_constant_of_unit): Constify.
	(convert): Constify.
	(help_erfc): complement, not compliment, :-)

	* fn-date.c (gnumeric_datedif): Use value_peek_string.