Enable online banking for Priorbank

[abitrolly]

Reticketed from #7:

• [x] activate and set credentials for online banking
• [ ] investigate capabilities and record the info
  • [ ] automatic API for querying balance
  • [ ] incoming flow control / restriction (don't accept money without clearance)
  • [ ] check automatic "tax pay" and "currency sell" rules enforcement
  • [ ] automatic monthly export for ledger
  • [ ] sub-budgeting (separated virtual accounts with funds for different purposes)

[abitrolly]

Enabled online + USSD banking today for Priorbank. It has nothing from the checklist above. Moved criteria to #10.