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See #55 instead (this PR closed/cancelled due to rebase)
Original description, see rebased PR for actual changes:
Cashflow Series Start Year
(final name & documentation still pending as of the time of this writing) with default value = 0 (existing NPV calculation behavior) and option to provide value = 1 to use Excel-style NPV calculation. Added unit tests that establish parity between this method and Excel documentation NPV example.