complete initial development of MGparm_dev

create mean reverting random walk using rho.  Implement this as
mgparm_dev_type=4
//    =(1-rho)*mean + rho*prevval + dev   //  where mean = 0.0

MGparm_dev_rwalk(k,j)=MGparm_dev_rho(k)*MGparm_dev_rwalk(k,j-1)+MGparm_dev(k,j);
For each dev vector created, read the stdev and rho as short parameter
lines just before reading mgparm_dev_phase
0 2 1 0 -1 0 -5 # L_at_Amin_Fem_GP_1_dev_se
0 2 0.2 0 -1 0 -5 # L_at_Amin_Fem_GP_1_dev_rho
0 2 1 0 -1 0 -5 # L_at_Amax_Fem_GP_1_dev_se
0 2 0.2 0 -1 0 -5 # L_at_Amax_Fem_GP_1_dev_rho
6 #_MGparm_Dev_Phase