Bug fix with irf restriction on period larger than 1
(cherry picked from commit 2d6e51373813feba80c3aefc380b200893fd605c)
1) Define a new type of parameter Random_prior_params, when prior/posterior mean mode do not work and the code searches randomly in the prior space a parameter combination that provides unique saddle path solution;
2) save point estimates in separate file, in order not lose work when subsequent analyses are done for prior/posterior mean/mode etc.
(cherry picked from commit 67d7ba75f0c306d29609fca7f99a2205cd820def)
Fixed bad representation of identification patterns for moment information matrix (and also fixed figure title)
(cherry picked from commit b3c4f9427fd64274230ed4fbc6068e5ecb82e4db)
Merge pull request #560 from rattoma/4.4

Irf restrictions and identification