Release v6.27.6

• [fix] received and delivered items to be billed report based on percentage billed
• [Fix] Show amount in credit note print format
• [fix] POS paid amount validation using grand total
• [fix] escape fg_item in production planning's get_so_items
• [travis]
• [fix] Modified date changed in query report due to project field renaming
• [fix] Get query for item in warranty claim
• [fix] Item query in bom