fix instances display
clean up event/span handling, custom labels
fix tooltips on non-events
add event listing
abstract cost data drawing (not done yet)
stable aggregate view
fix selection issues, multi-loading issues
temp fix load cost data in one lump;loading in smaller chunks miscalculates stats
fix totals calculations when loading costs in segments
avoid writing other overviews to cost summary
properly switch between views
small fixes
template-tize html