Trent Maetzold

OISRateHelper uses index fixing calendar for date generation, should use paymentCalendar

5

`OISRateHelper` class does not appear to be using the calendar passed to the `paymentCalendar` parameter for calculating the start date of the helper. I'm constructing Chile Camara today and 6/19...

OISRateHelper should take a QuoteHandle for overnightSpread parameter

2

The constructor for OISRateHelper takes a float for the overnightSpread argument. It would be nice if it took a Quote object so that the curve doesn't need to be rebuilt...