Update main 6.2 Policy Flow and syntax for serial numbers

[zungundp]

• Update 6.2 policy flow #289
• Update Serial Number Issuance (by block).  #290
• Update ledger to communicate lifecycle events #291
• Update transaction statements and notifications #292
• Link dashboard to pending actions & enable search by Serial Number: #293
• Enable search for the status and full ledger of activities for each serial number #294