Merge pull request #94 from Posnic/sales-bill

Customer discount in sales bill
 customer payement
Merge pull request #95 from Posnic/customer-payment

 customer payement
 customer payment
Merge pull request #96 from Posnic/customer-payment

 customer payment
customer payement
Merge pull request #97 from Posnic/customer-payment

customer payement
opening stock
Merge pull request #98 from Posnic/opening-stock

opening stock
opening stock form design
Merge pull request #99 from Posnic/opening-stock

opening stock form design
opening stock
Merge pull request #100 from Posnic/opening-stock

opening stock
opening stock update
opening stock fixed Nan
Merge pull request #101 from Posnic/opening-stock

Opening stock
opening stock approve and delete functionality
Merge pull request #102 from Posnic/opening-stock

opening stock approve and delete functionality
opening stock finished
Merge pull request #103 from Posnic/opening-stock

opening stock finished