Intermediary commit, where warehouse good numbers reflect the changes made by ordering things.
Added error message dialog box when trying to add items to cart that are out of stock. Removed deprecated method for checking item availability.
Merge branch 'master' of https://github.com/AtsK/KAT_prj

Conflicts:
	POS/src/ee/ut/math/tvt/salessystem/ui/panels/PurchaseItemPanel.java
	POS/src/ee/ut/math/tvt/salessystem/ui/tabs/PurchaseTab.java