* Enable `weekly` and `biWeekly` period in asset
* Expose `(PO_FirstN,N)` which will exempt fee for first N period in installment
* add `accountTxnAmt` `feeTxnAmt` `bondTxnAmt` to query transaction amount
* `readBondsCf()` will return empty if no bond flow found
* factor out multi-scenario run into seperate run points ( runByScenario(), runPoolByScenario() )
* include notebook gallery