series/quantiles: source-based quantile support
Old behaviour: ============== creativity-series previously removed non-finite values, and sorted the rest, producing something like: t,1st,2nd,3rd,... 2,10,11,12 3,3 (where t=0 and t=1 have no finite values, t=3 has only one non-finite, etc.). This discards any association with the files they come from, however, which means any sort of source-based confidence exclusion is impossible. creativity-series-quantiles then used these pre-sorted values to produce another .csv of quantile values. createivity-series-graphs accepted either one--if the series file, it calculated quantiles on the fly; if the quantiles, it used the pre-calculated quantiles. New behaviour: ============== creativity-series now just generates something like: t,source1,source2,source3 0,nan,nan,nan 1,nan,nan,nan 1,12,10,11 2,nan,3,nan which creativity-series-quantiles and creativity-series-graphs now understand: they does the nan trimming and sorting, then calculate quantiles. creativity-series-graphs also gains an entirely new ability, with flag --source-confidence (but only when given a creativity-series file): to select a confidence region by excluding (1-x)% of source files, then plotting the minimum and maximum values remaining after removal of the most non-median values. This is done by calculating (p-0.5)^2 for the inverse quantile p for each time period, then summing these up across time periods: the source files with the largest scores are excluded. (see --help for the gory details).
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