only creates the popmap file if one isn't already present
makes the creation of the popmap file simpler
Respecting a detected popmap file means that a user can use manually-edited population definitions irrespective of the naming convention. Of course it would be best to have the filenames reflect the associated population, but this might not always be the case (localities or other non-genetic-population distinctions).
This change does two things:
popmapfile if one isn't already presentpopmapfile simplerRespecting a detected
popmapfile means that a user can use manually-edited population definitions irrespective of the naming convention. Of course it would be best to have the filenames reflect the associated population, but this might not always be the case (localities or other non-genetic-population distinctions).