Pass an explicit base date to inflation curves instead of an observation lag #1896
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This removes the need for a base rate in zero inflation curves.
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The base date of an inflation curve should correspond to the latest published inflation fixing, because that's the boundary between what we already know and what we need to forecast.
This is awkward to specify by means of an observation lag, which is probably the wrong concept anyway—it's tied to instruments T&Cs. With these changes, it's possible to pass the base date directly. Constructors taking the observation lag are now deprecated.