Add positive and negative controls

[andersgs]

To be ISO17025 complaint, we should have the possibility of running a positive and negative control with each run.

However, we may not wish to output the results with the data, or allow the user some way of easily filtering the negative and positive control out of the final outcome.

Either way, running the controls should not be the default setting. It should be an optional flag.

Also, the data will not need to be a full genome. Just a relevant section. That will help keep the package size small.