Bug fix with irf restriction on period larger than 1
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.
Fixed bad representation of identification patterns for moment information matrix (and also fixed figure title)
Merge pull request #559 from rattoma/master

Irf restrictions and identification