Added queries to MainModel
Added accountId in the constructor,changed type of Saledate attribute in Date type
Added getSalesByDate()
comments
Update MainModel.java
Update DataUpdates.java
Update MainModel.java
Update DataUpdates.java
Merge branch 'master' into PawelNew

Conflicts:
	src/com/group8/model/MainModel.java
ver_6
ver_7