Proration and day-count fractions (30/360, ACT/365F, ACT/360, ACT/ACT ISDA) on half-open date ranges

Overview

Computes the year fraction of up to 100 half-open date ranges [start, end) under a named ISDA day-count convention, and optionally the prorated charge, for an agent billing a partial period or accruing interest. Conventions follow Section 4.16 of the 2006 ISDA Definitions: 30/360, 30E/360, 30E/360 (ISDA), Actual/365 (Fixed), Actual/360, Actual/Actual (ISDA), 1/1. `end` is the day immediately following the last day included, as the ISDA text defines it. With `period` the charg

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