distance between two means, F distributed eq 6.23 on pp284 of Johnson&Wichern params: p: dimensionality (number datapoints per sample) n1/n2: number items in mean1/2 sp1/sp2: mean waveforms Cinv: inverse covariance matrix alpha:significance values returns: dist -> left hand side of eq6.23 c2 -> c2 value, right hand side of eq6.23 urut/nov05