- now not only for GUI but also for CLI the country argument is checked
- added a check at the start to see if a country is to process is specified. Otherwise closing the GUI without selecting anything resulted in a runtime error.

…d .osm.pbf files (#43)

- use the files modification date, not the creation time. On windows this seemed to occasionally see newly downloaded files as the ones they replaced.
- check for a full match instead of doing a wildcard match while checking for existing maps. This prevents matching to multiple maps like australia and australia-oceania.

- change pylint findings
- format constans on save
- delete unused comments