Fixed Reinvestments and a number of other minor bugs.

Closes #176
Implemented loading cash flows from XML

Used QXMLStreamReader/QXMLStreamWriter
Merge branch 'Development'
GenericCashFlow now supports stocks and flows
Fixes for stocks and flows.

Implemented stock and flows for mortgages
Relates to #88
Implemented stocks and flows in tranche cash flow.

Using it in waterfall calculation and separating accrue and calculation for Junior Fees and Interest
Relates to #172
Relates to #88
Implemented Stock and Flows in Deferred Interest

Relates to #88
Fixed Major Bug in Adding Cash Flows
Implemented multiple starting deferred interest for multiple coupons.

OC uses Accrue/Pay
Other minor bugfixes
Relates to #172
Relates to #88
Implemented IC separation of calculation and payment

Relates to #172
OC and IC test now can change test target in time and the most restrictive it is stored in the CAsh Flows and used in excel output

Closes #127
Prevent overwriting test results with port-cure values

Relates to #127
Deferred Junior fees are a stock.

Closes #172
Closes #88
Merge branch 'Development'