These files map 2017 dates to 2016 representative dates, for the purposes
of creating 2017 emissions from sectors processed for 2016.
Rep dates are matched up according to day-of-week. For holidays that are
not on the same day of week every year, only the holiday itself is matched to 
the equivalent holiday from the other year, not the day after, because most of 
the day after is not a holiday and is better matched with the actual 
day-of-week). For holidays that are on the same day-of-week every year
(Memorial, Labor, Thanksgiving), we can map the holiday itself and the day 
after as well.
Also, the Good Friday holiday is not used at all because Easter is not always 
in the same month every year.
