Release v5.5.0

• [change-log]
• [fix] serial no validation in return entry
• [fix] test-case, warehouse mandatory for mix type product bundle
• [enhancement] auto insert item price if missing, #3533
• [enhancement] make service type product bundle:
• [translations] updated
• Validate serial no in return entry with against document
• [fix][patch] Remove fifo stack entry if qty after transaction is zero via stock reconciliation
• [fix] Get fifo rate only qty exists in batch
• Update fix_invoice_outstanding.py
• [fix] Ignore if error coming while sending emails to system managers
• [patch] Fix outstanding amount for original invoice for return entry
• [patch] Fix outstanding amount for original invoice for return entry
• Allow payment against invoice with negative outstanding
• Update outstanding in original invoice from return invoice
• [fix] Allow against purchase invoice against credit amount row
• [fix] get items from bom in material request
• [fix] payment reconciliation
• [test case] Test case for discount amount on net total
• Patch to notify system managers if there are any wrong entries due to bug related to discount amount on net total
• [fix] Tax calculation while discount applied on net total
• [fix] newsletter list unique check
• [fix] Get open SO in production planning tool
• [fix] force stock_uom in item and stock ledger entry
• Propogate root type and report type into children based on parent
• [minor] removed Link/DocType in Payment Period Based on Invoice Date
• [fix] UOM conversion factor in stock entry
• [fix] uom conversion factor in stock entry, #3734