Release v6.14.0

• [videos] added missing videos
• video help page on report builder and shopping cart
• [change-log]
• [translations] + added Gujarati - Fixes frappe/translator#63
• [minor] UOM message
• Additional Discount amount based on percentage
• [fix] Validate transfer qty cannot be greater than qty
• [fix] Group account merging with sub-ordinate group
• By: nabinhait
• Cleanup in cash flow
• Cash Flow Report
• Cash Flow Report
• Cash Flow Report