Change the order that maps get displayed in the DataVisualization page

[coverney]

Currently in DataVisualization.js the maps that get displayed are determined by the mapsToDisplay state variable, which is an array of variable names. When a user checks a new variable, the variable name gets appended to the end of mapsToDisplay and the map is generated at the end. This ordering might not be the most intuitive since users would have to scroll to see the newest map. Also, the order of the maps won't match the checkboxes. Some alternative ideas include

• append new variables to the top of mapsToDisplay so the maps display at the top
• have the map order match the order of variables in the checkbox question

[coverney]

not addressing this issue yet, since one might want to re-structure the DataVisualization page first and re-size the maps