1999-06-16  Jukka-Pekka Iivonen  <iivonen@iki.fi>

	* src/fn-math.c (gnumeric_gcd): Made GCD() to take variable number
 	of arguments.

	* src/fn-stat.c (gnumeric_rank): RANK() fixed.

	* src/fn-eng.c (gnumeric_erf): ERF() fixed to return negative
	results if the argument is negative too like in Excel.

	* srg/fn-eng.c (get_real_and_imaginary): Added a branch for empty
 	imaginary part.

	* src/fn-eng.c (gnumeric_improduct, gnumeric_imsum): Made IMSUM()
	and IMPRODUCT() to take variable number of arguments.