Adding testcase for checking whether an part is still on stock.
Extend tests and fix a litle failure
Extending Part-model with functions to check whether item is in stock and below minimal stock if set.
Make usage of Model-functions inside list template
Add a rule to part detail page if part is below min_stock or out of stock
Adding a view for list of parts which needs reordering

This adds a view returning all items which are out of stock or on_stock < min_stock. Currently using default list template for parts and some queryset-exclude rule.
Removing trailing spaces
Adding a list showing parts need reordering and extending parts detail page by a warning, that part is getting out of stock
Add some more verbose names for fields of Part model