Prevent recursive BOMs

- If A has B in its BOM, A cannot be added to the BOM of B

InvenTree/InvenTree/settings.py

@@ -11,7 +11,8 @@ https://docs.djangoproject.com/en/1.10/ref/settings/
 """
 
 import os
-
+import logging
+import logging.config 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
@@ -28,6 +29,12 @@ DEBUG = True
 
 ALLOWED_HOSTS = []
 
+if DEBUG:
+    # will output to your console
+    logging.basicConfig(
+        level = logging.DEBUG,
+        format = '%(asctime)s %(levelname)s %(message)s',
+    )
 
 # Application definition