.ser updated
Renamed buttons in financials tab to align with functionality
Merge branch 'master' into darren
Expense displaying total price
get all profits and today's profits
Merge branch 'master' into darren
removed surplus code in invoice class
Changes to profit tables
Merge branch 'master' into darren

Conflicts:
	sales.ser
	src/GUI/FinancialFormListener.java
	src/GUI/FinancialFormPanel.java
	src/GUI/FinancialMainPanel.java
	src/model/Shop.java
	stocks.ser
added ser files
added call to daily expense function to daily expense button