Implement orders history API
Merge branch 'master' into task-2.4
Merge branch 'master' into task-2.4
Save orders into history
Add new window
Fix history table
Fix bug
Merge branch 'master' of https://github.com/liivur/Ryhm1

Conflicts:
	trunk/src/ee/ut/math/tvt/salessystem/ui/tabs/PurchaseTab.java