Improvements and fixes

• Improved Portal status under Tools.
• Added support for looking up cities in Belgium, the Netherlands, and Germany based on postcode.
• Export files are now locked until they have been fully written.
• Improved label error messages.
• Fixed issue with waybill template not being saved for later shipments.
• Fixed issue where DG office integration prevents customers from using carriers that do not have DG goods types.
• Fixed issue with MassPrint ignoring a sorted list when editing a shipment.
• Fixed problems with PNG output on DHL NL.
• Performance and stability improvements.
• Various technical fixes and refactoring.