Improve error messaging to resolve bugzilla (#2468)

The error messaging for fatal errors in ush/forecast_postdet.sh is 
improved to add "FATAL" where missing and state the file that is 
missing (when not already mentioned). Correction of the error 
message mentioned in the bugzilla is included in this.

Bugzilla 1374 is resolved with this commit.

Resolves #1253

ush/forecast_postdet.sh

@@ -64,7 +64,7 @@ EOF
             increment_file="${COM_ATMOS_ANALYSIS}/${RUN}.t${cyc}z.${PREFIX_ATMINC}atmi${incfhr}.nc"
           fi
           if [[ ! -f ${increment_file} ]]; then
-            echo "ERROR: DOIAU = ${DOIAU}, but missing increment file for fhr ${incfhr} at ${increment_file}"
+            echo "FATAL ERROR: DOIAU = ${DOIAU}, but missing increment file for fhr ${incfhr} at ${increment_file}"
             echo "Abort!"
             exit 1
           fi
@@ -148,7 +148,7 @@ EOF
 
   _suite_file="${HOMEgfs}/sorc/ufs_model.fd/FV3/ccpp/suites/suite_${CCPP_SUITE}.xml"
   if [[ ! -f ${_suite_file} ]]; then
-    echo "FATAL: CCPP Suite file ${_suite_file} does not exist!"
+    echo "FATAL ERROR: CCPP Suite file ${_suite_file} does not exist!"
     exit 2
   fi
 
@@ -569,7 +569,7 @@ WW3_postdet() {
       if [[ ${RERUN} = "NO" ]]; then
         echo "WARNING: NON-FATAL ERROR wave IC is missing, will start from rest"
       else
-        echo "ERROR: Wave IC is missing in RERUN, exiting."
+        echo "FATAL ERROR: Wave IC ${waverstfile} is missing in RERUN, exiting."
         exit 1
       fi
     else
@@ -592,7 +592,7 @@ WW3_postdet() {
   if [[ "${WW3ICEINP}" = "YES" ]]; then
     local wavicefile="${COM_WAVE_PREP}/${RUNwave}.${WAVEICE_FID}.${cycle}.ice"
     if [[ ! -f ${wavicefile} ]]; then
-      echo "ERROR: WW3ICEINP = ${WW3ICEINP}, but missing ice file"
+      echo "FATAL ERROR: WW3ICEINP = ${WW3ICEINP}, but missing ice file ${wavicefile}"
       echo "Abort!"
       exit 1
     fi
@@ -602,7 +602,7 @@ WW3_postdet() {
   if [[ "${WW3CURINP}" = "YES" ]]; then
     local wavcurfile="${COM_WAVE_PREP}/${RUNwave}.${WAVECUR_FID}.${cycle}.cur"
     if [[ ! -f ${wavcurfile} ]]; then
-      echo "ERROR: WW3CURINP = ${WW3CURINP}, but missing current file"
+      echo "FATAL ERROR: WW3CURINP = ${WW3CURINP}, but missing current file ${wavcurfile}"
       echo "Abort!"
       exit 1
     fi
@@ -697,7 +697,7 @@ MOM6_postdet() {
   # Link increment
   if [[ "${DO_JEDIOCNVAR:-NO}" = "YES" ]]; then
       if [[ ! -f "${COM_OCEAN_ANALYSIS}/${RUN}.t${cyc}z.ocninc.nc" ]]; then
-          echo "FATAL ERROR: Ocean increment not found, ABORT!"
+          echo "FATAL ERROR: Ocean increment ${COM_OCEAN_ANALYSIS}/${RUN}.t${cyc}z.ocninc.nc not found, ABORT!"
           exit 111
       fi
       ${NLN} "${COM_OCEAN_ANALYSIS}/${RUN}.t${cyc}z.ocninc.nc" "${DATA}/INPUT/mom6_increment.nc"