Allow nipype configuration directory to be specified with NIPYPECONFDIR

Author: stilley2

nipype/utils/config.py

@@ -97,7 +97,9 @@ def __init__(self, *args, **kwargs):
         self._config = configparser.ConfigParser()
         self._cwd = None
 
-        config_dir = os.path.expanduser('~/.nipype')
+        config_dir = os.path.expanduser(
+            os.getenv('NIPYPECONFDIR',
+                      default='~/.nipype'))
         self.data_file = os.path.join(config_dir, 'nipype.json')
 
         self.set_default_config()