Add a "plot order changer" function to the program

[StuntsPT]

Currently there is no way to change the individual order in the plot, except by altering the input file.
A "plot order changer" function would take as input a single column file, with as many rows as there are individuals in the plot. Each row would contain a unique value, between 1 and "N" (where "N" is the total number of individuals) representing the order under which each individual should be placed.
An example with 4 individuals:

1
4
2
3

Using this orderfile would cause the first individual in the input file to be plotted in position "1", the second individual in position "4", the third individual in position "2", and the fourth individual in position "3".
Please leave a comment if you are interested in this feature.