Reset seed before drawing starting points of MCMC chains

Removes stochastics between different runs while not affecting the subsequent MCMC computations for which the seed is also reset and saved
Closes #1048

matlab/metropolis_hastings_initialization.m

@@ -113,6 +113,7 @@ if ~options_.load_mh_file && ~options_.mh_recover
     fprintf(fidlog,' \n');
     % Find initial values for the nblck chains...
     if nblck > 1% Case 1: multiple chains
+        set_dynare_seed('default');
         fprintf(fidlog,['  Initial values of the parameters:\n']);
         disp('Estimation::mcmc: Searching for initial values...')
         ix2 = zeros(nblck,npar);