Explore creating new object class for minimum spanning networks

[zkamvar]

The minimum spanning networks at the moment contain three elements:

1. The graph
2. The population names
3. The colors used for populations

The second element is fairly redundant with the third since the third contains the names of the populations.

One slightly irritating thing about the minimum spanning networks is the fact that, if you want to check a different stratum, you have to rerun the network even though the basic structure of the network is the same. The only difference the stratum makes is the distribution of the pie pieces.

To counteract this, the new object could contain the following:

• The graph
• The stratification data frame
• The multilocus genotype assignment
• A list of named color vectors for each stratification

This setup would give the minimum amount of information to be able to explore the graph using all strata and it could be used directly with plot_poppr_msn() without needing the genind object.

If we REALLY wanted to make it a standalone object, we could also include the distance matrix with it, but that would make the object much larger than it needs to be.