Update accounts_receivable.py
removed contact person for lead filter
Minor fix in accounts receivable report
Set expense account for perpetual inventory only non-opening invoices
stashed footer page
shipping address in quotation fixed for customer validation
added StockFreezeError, and uncomment stock_auth_role check
initial tests for freeze stock functionality
fix bug by coercing stock_frozen_upto_days value to int
fixed typo add_date -> add_days
webnotes/erpnext#912 stay updated button fixed in website
webnotes/erpnext#1362 allow renaming of sales and purchase taxes and charges master
label/message update in error reporting
import add_date, removed timedelta import
tabify modifications, minor coding style/message updates
changed stock_frozen_upto to stock_frozen_upto_days, and added validation for it in stock ledger
initial prototype implementation for issue #856