Add multi-stock feature
Finished task
1. User can add stock location in config page. Adding format is StockA,StockB,StockC for example
2. Item page, there is no more quantity column show in cert table. The quantity tracking is integrated in inventory detail
3. Receiving page, There is a stock location for user to select before receiving or returning stuff
4. Sale page, There is a stock location which is for user to select a stock location they sell from

Remain task
1. Requisition work flow
2. Language editing
3. Remove unuse code

PS