Added example usage of EXPLAIN_TEMPLATE_LOADING configuration variable.

This Flask configuration is usefull for debugging Jinja template loading precedence.

conf/mentat-hawat.py.conf

 # Force enable the debug mode.
 #DEBUG = True
 
+# Debug template file loading precedence.
+#EXPLAIN_TEMPLATE_LOADING = True
+
 # Move the application from webserver root to different location.
 #APPLICATION_ROOT = '/mentat'
 

lib/vial/config.py

@@ -156,6 +156,10 @@ class DevelopmentConfig(Config):  # pylint: disable=locally-disabled,too-few-pub
     DEBUG = True
     """Overwrite default :py:const:`vial.config.Config.DEBUG`."""
 
+
+    EXPLAIN_TEMPLATE_LOADING = True
+    """Debug template file loading precedence."""
+
     #---------------------------------------------------------------------------
     # Custom application configurations.
     #---------------------------------------------------------------------------