Plot_results does not work due to the check of the number of tif files

The plot_results has two issues:

1. It should check the number of kml files, not kmz. Unless we are producing kmz files and not kml, but the demo data has only kml files. Maybe we should do the check the png files.

Make sure the number of the .tif files fits to the number of the .kmz files and that
                there are no other files from previous runs.
                If you have resumed a run, then the data of the aborted and the continued run needs 
                to be in the Results directory. You need them for plotting the classification map.

2. It should compare only the .tif files that start with step_ because the user might have their the HabitatSampler.tif which is ok because it will be overwritten. The use should be able to call the function just with the demo data, and the HabitatSampler.tif will be there in such case.

These are two cases for each the Unit-tests would have done the check for us.