* Update transaction.js
* setup barcode scan
stock entry controller not inherited from transaction.js, need to call setup barcode scan from transaction.js
* fix bug of item_code change always reset qty to 0
when calling frappe.model.set_value(dt,dn,'item_code',xxx), even qty is set, system always reset qty to 0.
* Update transaction.js
* Update transaction.js
* Update transaction.js
* Update transaction.js
* Update transaction.js
* Update transaction.js
* clean up barcode logic for transactions
* call scan_barcode method for stock entry
* separate out logic for searching serial, batch or barcode number
* added scan barcode field in transactions doctype
* search barcode-serial-batch sequence, code rectify
* hide all barcode related field if disabled from settings
* remove print statement
* Update stock_entry.py