[PLAT-3725] Adding a zero coupon inflation node
[PLAT-3725] Adding zero coupon inflation nodes to curve node id mapper
[PLAT-3739] Adding zero coupon inflation nodes to fudge builders
[PLAT-3725] Getting all currencies for zero coupon inflation nodes
[PLAT-3725] Supporting zero curve inflation nodes in all visitors
[PLAT-3732] Convention for price indices
[PLAT-3742] Fudge builder for price index convention