First pass on getting a grid to show in map view that has plotted points. We are ready now to count the points in each rectangle and base the color of the rectangle on that count.
* And now coloring of rectangles is happening based on counts.
Merge branch 'master' of https://github.com/concord-consortium/codap into wip_map_grids
Implement grid to show in map view that has plotted points. We are ready now to count the points in each rectangle and base the color of the rectangle on that count.
* And now coloring of rectangles is happening based on counts.
* Show count in tool tip. Limit rectangles to those with non-zero count.
* Some refactoring to move useful routines into mapDataConfiguration
* Hiding and showing all points
* Only show grid slider when grid is visible
* Respond dynamically changes in number of visible cases
* Add Hide Selected/Unselected Cases and Show All Cases to gear menu when points are visible [#Fixes 79322016]
* During zoom, points are now hidden
* Includes some code cleanup done with Jonathan during review
Merge branch 'wip_map_grids'