Plot size frequency histogram
vpr_plot_histsize(data, param, title = NULL, bw = 0.1, xlim = NULL)
size data from auto_measure_mm subset into taxas
size parameter of interest (corresponds to sub lists within data argument)
main title for plot, if left null will default based on parameter and taxa
bin width, defines width of bars on histogram, defaults to 0.1, decrease for more detail
plot xlimit, defaults to min max of data if not provided
E. Chisholm