Check for MODULESHOME environment variable for gadi support (#210)

* Check for MODULESHOME environment variable for gadi support

* Changed default version

payu/envmod.py

@@ -15,14 +15,18 @@
     subprocess.check_output = check_output
 
 DEFAULT_BASEPATH = '/opt/Modules'
-DEFAULT_VERSION = '3.2.6'
+DEFAULT_VERSION = 'v4.3.0'
 
 
 def setup(basepath=DEFAULT_BASEPATH):
     """Set the environment modules used by the Environment Module system."""
 
     module_version = os.environ.get('MODULE_VERSION', DEFAULT_VERSION)
-    moduleshome = os.path.join(basepath, module_version)
+
+    moduleshome = os.environ.get('MODULESHOME', None)
+
+    if moduleshome is None:
+        moduleshome = os.path.join(basepath, module_version)
 
     # Abort if MODULESHOME does not exist
     if not os.path.isdir(moduleshome):