Added first draft of code to make a histogram.
Added the boxes for the histograms.
Added an option in init_graph to allow for the vertical axis to be toggled off in an image.
Added the labels to the plots of the histograms.
Added a mutliplier to adjust the vertical scale of the histograms.
Added a vertical, frequency axis for each histogram in a data set.
Removed the label at deltax/y to the middle of the axes in the init_graph routine.