FHMAX_WAV_IBP variable check for wavepostbndpnt job

- add variable override in exgfs_wave_post_bndpnt.sh for FHMAX_WAV_IBP
- add check to config.wavepostbndpnt for when FHMAX_GFS is less than FHMAX_WAV_IBP;
set FHMAX_WAV_IBP to equal FHMAX_GFS when shorter gfs forecast than 180hrs; resolves
runtime error with wavepostbndpnt job waiting for forecast output that will never arrive

Refs: #238

parm/config/config.wavepostbndpnt

@@ -8,4 +8,7 @@ echo "BEGIN: config.wavepostbndpnt"
 # Get task specific resources
 . $EXPDIR/config.resources wavepostbndpnt
 
+export FHMAX_WAV_IBP=180
+if [ $FHMAX_GFS -lt $FHMAX_WAV_IBP ] ; then export FHMAX_WAV_IBP=$FHMAX_GFS ; fi
+
 echo "END: config.wavepostbndpnt"

scripts/exgfs_wave_post_bndpnt.sh

@@ -41,7 +41,7 @@
   # Set wave model ID tag to include member number
   # if ensemble; waveMEMB var empty in deterministic
   export WAV_MOD_TAG=${CDUMP}wave${waveMEMB}
-  FHMAX_WAV_IBP=180
+  FHMAX_WAV_IBP=${FHMAX_WAV_IBP:-180}
 
   postmsg "$jlogfile" "HAS BEGUN on `hostname`"