create a modified DistributionWAgg function to be able to extract not just the best estimate but also upper and lower bounds of the aggregated distribution
created a code folder where the script containing the modified function is, so it can be sourced
added the aggreCAT package wherever we need to use the modified function, because it still has internal aggreCAT functions that we need
initially the aggregation computation was in the aggregation chapter but we moving it to the data input chapter seems better so we can save the aggregated values ahead of time for the shiny app -- it would be too slow otherwise
some other minor changes to add chunk titles, small code improvements
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