added extra example for gauss retrieval

Run/Control/CONTROL_OD.OPER.FC.gauss.global

+START_DATE 20180809
+DTIME 1
+TYPE AN FC FC FC FC FC FC FC FC FC FC FC AN FC FC FC FC FC FC FC FC FC FC FC
+TIME 00 00 00 00 00 00 00 00 00 00 00 00 12 12 12 12 12 12 12 12 12 12 12 12
+STEP 00 01 02 03 04 05 06 07 08 09 10 11 00 01 02 03 04 05 06 07 08 09 10 11
+ACCTIME 00/12
+ACCTYPE FC
+ACCMAXSTEP 12
+CLASS OD
+STREAM OPER
+GRID 0.2  
+LEFT -10.
+LOWER 30.
+UPPER 60.
+RIGHT 30.
+LEVEL 137
+RESOL 799
+GAUSS 1
+FORMAT GRIB2
+PREFIX ENHG_
+ECTRANS 1