Update hashes; fix devbuild.sh (#94)

## DESCRIPTION OF CHANGES:
* Update hashes of regional_workflow and ufs-weather-model to work with PR #[416](https://github.com/NOAA-EMC/regional_workflow/pull/416) into regional_workflow.
* Fix devbuild.sh to work with new .env files (instead of old README files).

## TESTS CONDUCTED:
See PR #[416](https://github.com/NOAA-EMC/regional_workflow/pull/416) in regional_workflow.

Externals.cfg

@@ -3,7 +3,7 @@ protocol = git
 repo_url = https://github.com/NOAA-EMC/regional_workflow
 # Specify either a branch name or a hash but not both.
 #branch = develop
-hash = 461e4e8
+hash = b490a36
 local_path = regional_workflow
 required = True
 
@@ -21,7 +21,7 @@ protocol = git
 repo_url = https://github.com/ufs-community/ufs-weather-model
 # Specify either a branch name or a hash but not both.
 #branch = develop
-hash = 63591b6
+hash = ea8a7aa
 local_path = src/ufs_weather_model
 required = True
 

devbuild.sh

@@ -35,7 +35,7 @@ if [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
   exit 0
 fi
 
-ENV_FILE="docs/README_${PLATFORM}_${COMPILER}.txt"
+ENV_FILE="env/build_${PLATFORM}_${COMPILER}.env"
 if [ ! -f "$ENV_FILE" ]; then
   echo "ERROR: environment file ($ENV_FILE) does not exist for this platform/compiler combination"
   echo "PLATFORM=$PLATFORM"