Improved the look of the plot (dimensions, labels)
Revised how we define the boxes in figure_1().
Refactored figure_1 into a) the underlying map and b) the markers on top.

This is cuz I'm gonna show the EBs on top in a second.
Made the xarray and yarray args into kwargs in case you ever want None.
I wrote a functioning version of "map the EBs".
Made plot symbols bigger in map_EBs.
Clarified what we print in how_many_periods_are_new.