GitLab

Create a full title for line and column charts.

Ensure that title contains all the selected data points when
aggregation is selected. Before this fix, only the first data point
was included

Function uses options from drop-down list that have been selected by a
user to populate the appropriate observations and then draw the
appropriate chart

It is assumed that this chart type will be used for visualizing
aggregated results

Also, add HTML for third dropdown list

Create parent `<div>` elements for both dropdown lists. In addition,
attach a barebones event listener to the new dropdown list

There seems to be conflict between the backend server (Node.js &
Express) and our front-end (browser-based) if we want to use module
imports and exports. It is not currently possible to use Node.js /
CommonJS modules. The current solution uses ES6 modules. May need to
look for a better approach.