Task 2.4 done

History tab implemented.
Merge remote-tracking branch 'origin/master'

Conflicts:
	POS/src/ee/ut/math/tvt/salessystem/ui/PaymentConfirmation.java
	POS/src/ee/ut/math/tvt/salessystem/ui/tabs/HistoryTab.java
Merge branch 'master' of https://github.com/JaanJanno/A-Team-1.git

Conflicts:
	POS/src/ee/ut/math/tvt/salessystem/ui/tabs/HistoryTab.java