Merge pull request #86 from Posnic/sales-quotation

customer discount in sales quotation
Merge pull request #87 from Posnic/sales-quotation

implement uom in sales quotation
Sales order
Merge pull request #88 from Posnic/sales-order

Sales order
customer discount in Sales order
Merge pull request #89 from Posnic/sales-order

customer discount in Sales order
customer discount in saleas delivery note
Merge pull request #90 from Posnic/delivery-note

customer discount in saleas delivery note
customer discount in sales delivery note
Merge pull request #91 from Posnic/delivery-note

customer discount in sales delivery note
customer discount in direct sales delivery note
Merge pull request #92 from Posnic/direct-delivery-note

customer discount in direct sales delivery note
 customer discount in direct sales
Merge pull request #93 from Posnic/direct-sales

 customer discount in direct sales
Customer discount in sales bill
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