V5 migration tweaks

• For very old c9 clients, 1 or 2 decades old who never have had to restore from online backups, migrator would fail because of very subtle non functional differences between an old database that is decades old vs one restored from backups. Now sorted (not nullpointer guards on db columns)
• A few minor odd variations in historical data, doucmented in gitlogs
• Tweaks to sublet migration, some bad sublet data where sublet status is mismatched from general ledger causing issues. Fixed by realigning the sublet with GL