Add 'About InvenTree' modal

- Accessible from the top-right dropdown menu
- Add InvenTree/version.py which contains helper functions

InvenTree/build/templatetags/inventree_extras.py

@@ -1,12 +0,0 @@
-""" This module provides template tags for extra functionality
-over and above the built-in Django tags.
-"""
-
-from django import template
-
-register = template.Library()
-
-
-@register.simple_tag()
-def multiply(x, y, *args, **kwargs):
-    return x * y

InvenTree/build/views.py

@@ -143,7 +143,6 @@ class BuildComplete(AjaxUpdateView):
                 location = StockLocation.objects.get(id=loc_id)
                 valid = True
             except StockLocation.DoesNotExist:
-                print('id:', loc_id)
                 form.errors['location'] = ['Invalid location selected']
 
             if valid: