Added lines to label only the query genotypes in the msn

I also cleaned up the code a little bit.

I realized that the MSN did not display the specific isolates, and the only way to differentiate between them would be to change the "Isolate" field. Since we can exclude some labels in the graph by setting that element of the vector to `NA`, I wrote a way to do that to label only the query isolates. This will make it much easier to find the query.