Feature/issue 2966 add 7 parameter ddm cdf and ccdf #4405

Job	Run time
mix/fun tests 2	1h 2m 4s
prim and rev tests	1h 2m 6s
mix/fun tests 1	1h 2m 5s
fwd tests and non-fun mix tests	1h 2m 6s
	4h 8m 21s

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