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'''
get_flat_header(group_results)
get_flat_header(group_results,combine=True)

* For use with pandas .groupby() and .agg() results
* For when you get back multilevel headers, and you just want one header list .
* Returns list of column names.

if combine=False (default), then it returns the column name as the last name in the list for that column.
      e.g. 

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%% DateTime transformations
% goals:
% * add time zone to datetime
% * convert to ISO_DateTime_UTC
% * convert to ISO_DateTime_local
% * get epoch time (seconds since 1970)
% * check epoch conversion

%starting with a matlab datenum format (no time zone).  But we know it is local (Mountain Time) timezone.
datenum = DATA.Time;  %in this data structure DATA.Time is a time with seconds resolution (no time zone in datenum)