Includes DB changes, you need to log all terminals out during upgrade

• Fix up  KTM/Husky EPC import. Changes to factory website broke login
• Disallow undelete txns on a giftcard whose reference was reused on a new voucher.
• Browse activity, view txn details would break things in very subtle ways. e.g. view txn details then delete would fail with txn not active. Now fixed
• Merge customers: was not merging unit invoices. Now fixed.
• Spares profit/sale : include new column to show stock turns
• Proficiency report fixes/improvements
  • Report incorrectly included quoted labour in computations. Now fixed
  • Include both progress to bill (estimated) labour and invoiced (actual) labour.  Show both figures on report under billed column.  Result is more intuitive and consistent on rerunning report.
• V4 Migration fixes
  • Problems with migrating giftcards from v4. Systems with recycled giftcards in them (e.g. you issue a giftcard, cancel it and then reissue), these will cause upgrade to fail. This version retrospectively fixes the migration issue.
  • Retroactive migration performance issue with migrating contact txns, bills etc. Previously was quite slow. Now improved.