get_unconstrained_struct_pars return structural parameters that indicate there are no constraints
(except possibly sign constraints).
See Virolainen (2020) for the conditions required to identify the shocks and for the B-matrix as well (it is W times a time-varying diagonal matrix with positive diagonal entries).
Intended to be called after calling the function
reform_constrained_pars to avoid remove the constraints
again in any further function calls as this will create bugs. Sign constraints are irrelevant in this context.
Returns a list with
$W being (d x d) matrix of ones and
NULL. If the
supplied argument is
No argument checks!
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