Use find_each to not load the *entire* set of variants into memory when a StockLocation is created
Simplify query for StockLocation#stock_item
Add message for empty order on backend UI

Also resolve parsing issue on admin/orders/shipment partial

[Fixes #2994]
Setup spec helper for javascript drivers.

[Fixes #3008]
Remove taxonomy.js leftover after las rebase

[Fixes #3003]
And taxon right-click menu file. Both cut and paste options were
previouly removed. I don't think people actually use that at all, plus
it complicates the code