Gets daily prices for the ICO composite and 4 groups from the website. Downloads the Excel file for the last two months, and if needs to then goes through the pdfs. Saves in a file called icoPrices.csv in coffeestats/data. Also calls loadICOprices() which returns a dataframe called prices. If writeCSV = FALSE, it just returns the dataframe without updating the csv (I can't remember why you would want to do that, so TRUE by default).
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