-> html table (including actions table + support for subtables)
-> evolution graphs
-> bar graphs
(not pie graphs, since it's not possible to show multiple serieses)
(not sparklines since we'd have to color code different comparisons, which would be confusing w/ evolution graphs since they have their own colors)
-> row evolution/overlay/transitions/segmented visitor log (they display on comparison rows and parameters should change appropriate for the specific compared period/segment)
NOTE: there is one issue here when the table is too big. When there are too many rows,
maxNumRowsToHandleEvents blocks row actions from displaying. Since comparing multiplies the amount of rows, it can happen often.