Feature/issue 2966 add 7 parameter ddm cdf and ccdf #4403

Job	Run time
fwd tests and non-fun mix tests	47m 3s
prim and rev tests	1h 18m 30s
mix/fun tests 1	1h 18m 32s
mix/fun tests 2	1h 18m 31s
	4h 42m 36s

Provide feedback