[pos] [minor] added pos in sales order for testing
[pos] moved pos realted code from sales_invoice.js to transaction.js
[pos] pos.js included in all selling & purchase cycle
[pos] pos view in all sales & purchase cycle finished
[pos] refresh() to be called at minimum
[fix] patch merge conflict fixed
Merge branch 'master' of github.com:akhileshdarjee/erpnext