dseries submodule update

— add bi-annual frequency
— do not return NaNs if a variable is 0 in all periods
— fixed bug (dates member was wrong)
parent 2ec5e407
Subproject commit a4479b5cb56b0f2b83d567652735c5410254f0fb Subproject commit 5ae52153303b71a256b8593cca10e4777e4b5d26
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