Implement excoupon parameters and payment calendar for CPIBonds, similar to what is already done in FixedRateBonds
Add withPaymentCalendar
Merge branch 'master' of https://github.com/lballabio/quantlib into excoupon_and_payment_calendar_parameters_for_cpi_bonds
Add paymentCalendar initialization to CPILeg constructor; Fix withPaymentCalendar() parameter
Make exCouponPeriod default false for CPI and fixed rate coupons
Move calendar creation to initialization list.
Merge pull request #104.