Release v6.21.0

• [change log]
• [translations]
• [fix] validate advance only if invoice total is positive
• Update search-record-by-specific-field.md
• Update managing-dynamic-link-fields.md
• [enhancement] default warehouse not mandatory in time, re-order level and re-order qty must always be set per warehosue
• [fix] pricing rule for variant, if rule for template available, use it
• [fix] [minor] reset naming series in delete_company_transactions.py
• [fix] Read permission to All for permlevel 1 fields
• [minor] validate address template before saving
• Update allow-fields-to-be-changed-after-submit.md
• [enhancement] Merge Comment and Feed into Communication 💥
• [minor] catch duplicate entry error in bank account creation
• [fix] Advance adjustment in invoice cannot be greater than grand total
• [fix] Serial no query in Quality Inspection
• [cleanup] leave application
• Duplicate last line delete
• Corrected typo while translating
• Update calendar.md
• Update wesite-home-page.md
• Update blogger.md
• Employees with no attendance show up as blank
• Minor fix
• Update overwriting-data-from-data-import-tool.md
• Update bank_reconciliation.py
• [fix] Translations in Stock balance report
• [fix] Remove filters on item group in territory and sales person target settings
• [fix] Set party account on chnage of company
• [fix] Make bank entry from expense claim
• [docs] remove /docs/current from repo, they are re-built anyways
• Update item_wise_purchase_history.json
• Update item_wise_sales_history.json
• Added From and To date to Holiday Report Changed HD to H in Monthly Attendance Report
• Update gross_profit.py
• [fix] newsletter priority
• Update leave_application.py