Update config.anal for historical fix files in GSI

In the v16.1.3 GSI release branch, the gfsv16_historical fix files of
global_convinfo.txt and prepobs_errtable.global have been updated.
New IF blocks in the config.anal file have been added to properly
use these new historical fix files. This allows for proper observation
use in parallels that are not running near realtime.

Refs: #420

parm/config/config.anal

@@ -95,8 +95,31 @@ if [[ $RUN_ENVIR == "emc" ]]; then
 #   Assimilate 135 (T) & 235 (uv) Canadian AMDAR observations
     if [[ "$CDATE" -ge "2020040718" && "$CDATE" -lt "2020052612" ]]; then
 	export CONVINFO=$FIXgsi/gfsv16_historical/global_convinfo.txt.2020040718
+	export OBERROR=$FIXgsi/gfsv16_historical/prepobs_errtable.global.2020040718
     fi
 
+#   Assimilate COSMIC-2
+    if [[ "$CDATE" -ge "2020052612" && "$CDATE" -lt "2020082412" ]]; then
+        export CONVINFO=$FIXgsi/gfsv16_historical/global_convinfo.txt.2020052612
+	export OBERROR=$FIXgsi/gfsv16_historical/prepobs_errtable.global.2020040718
+    fi
+
+#   Assimilate HDOB
+    if [[ "$CDATE" -ge "2020082412" && "$CDATE" -lt "2020091612" ]]; then
+        export CONVINFO=$FIXgsi/gfsv16_historical/global_convinfo.txt.2020082412
+    fi
+
+#   Assimilate Metop-C GNSSRO
+    if [[ "$CDATE" -ge "2020091612" && "$CDATE" -lt "2021031712" ]]; then
+        export CONVINFO=$FIXgsi/gfsv16_historical/global_convinfo.txt.2020091612
+    fi
+
+#   Assimilate DO-2 GeoOptics
+    if [[ "$CDATE" -ge "2021031712" && "$CDATE" -lt "2021091612" ]]; then
+        export CONVINFO=$FIXgsi/gfsv16_historical/global_convinfo.txt.2021031712
+    fi
+
+
 #   NOTE:
 #   As of 2020052612, gfsv16_historical/global_convinfo.txt.2020052612 is
 #   identical to ../global_convinfo.txt.  Thus, the logic below is not