1999-06-25  Morten Welinder  <terra@diku.dk>

	* src/fn-eng.c (eng_functions_init): Extend impower to handle two
 	complex numbers.
	(eng_functions_init): Prepare for besseli and besselk.  Docs
 	please.

	* src/mathfunc.c (dweibull, pweibull, ppois, dpois, dexp, pexp,
 	dbinom, pbinom, qbinom, besseli, besselk): New functions.

	* src/fn-stat.c: Use new mathfuncs.
	(gnumeric_kurt): Use range function.
	(gnumeric_kurtp): New function.
	(gnumeric_skewp): New function.

	* src/mathfunc.c (range_skew_est): Rename from range_skew.
	(range_skew_pop): New function.
	(range_kurtosis_m3_est): New function.
	(range_kurtosis_m3_pop): New function.

	* src/fn-math.c (gnumeric_gcd): Cleanup and fix.