* additional information about how to use Correlations popup
* handling of all-nan data in charts popup
* styling issues on popups (especially Histogram)
* removed auto-filtering on correlation popup
* scatter point color change
* added chart icon to cell that has been selected in correlation popup
* responsiveness to scatter charts
* handling of links to 'main','iframe' & 'popup' missing data_id
* handling of 'inf' values when getting min/max & describe data
* added header to window popups (correlations, charts, ...) and a link back to the grid
* added egg building to cirleci script
* correlation timeseries chart hover line