Fix GetXIRR()
Convert Repayments report to Excel(#371)
Convert Collection Sheet to excel(#374)
Add event aggregator
Merge branch 'master' of https://github.com/PavelBastov/opencbs
Add repayment service
Add normal repayment script
Add repayment service
Fix references
Fix references
Debug python scripts
Fix rapay and save method
Repayment test ANNUITY for normal and late

AMK
Add repayment window presenter
Use Installment from core domain in schedule engine
Rebuild normal repayment using tests
Fix normal repayment logic
Remove loan saving from repayment service to loan service
Add repayment view
Link repayment presenter and view