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This functions computes SARMA or multiplicative (p,q) x (P,Q) models for
(p,q,P,Q) in (pvec x qvec x Pvec x Qvec) it returns the best according to AIC
where AIC has been modified to account for fixed parameters
x = input data
pvec = vector of p s set pvec=[0] for no AR
qvec = vector of q s set qvec=0[] for no MA
Pvec = vector of P s
Qvec = vector of Q s
T period for multiplicative model
