more debug logging for queries
split out function that formats datapoint results
clone get_observations for use by country profile
convert 1st datapoints query from datapoints_cpc
convert 2nd query from datapoints_cpc
convert 1st query from datapoints_cpt
convert 2nd query from datapoints_cpt
rewrite get_columns to remove duplicates
extract method to add missing notation to cache
guess URIs for breakdown, indicator, unit-measure
let virtuoso perform whitelisting
add missing variable definition
optimize dimension-options query

only get time-period extra information if query is for time-period