Modify unit test for mode_compute=8 to set optimizer options

tests/fs2000/fs2000_mode_compute_8.mod

@@ -72,4 +72,11 @@ varobs gp_obs gy_obs;
 
 options_.solve_tolf = 1e-12;
 
-estimation(order=1,datafile=fsdat_simul,nobs=192,mode_compute=8,loglinear,mh_replic=0);
+estimation(order=1,datafile=fsdat_simul,nobs=192,mode_compute=8,loglinear,mh_replic=0,optim=(
+'MaxIter',5000,
+'TolFun',1e-4,
+'TolX',1e-4,
+'MaxFunEvals',5000,
+'MaxFunEvalFactor',500,
+'InitialSimplexSize',0.05
+));