Make Cosine Packet signal
cospkt = MakeCosinePacket(d,b,k[,Bell,D,n])
1-d packet index
bellname e.g. 'Sine'
D >= d; default =d.
signal length (n > 2^d; default 2^(d+5))
1-d signal; the requested cosine packet
This function returns the cosine packet basis element corresponding to position (d,b,k) in the CP table.