update automatic visit/subject importer
- every subject that does not have a default appointment place should be assigned one
- country should be filled in by Luxembourg (configurable)
- configuration of the importer should be in GUI
-
there should be possibility to have more than one source(impossible for now due to django_cron data model) - automatic import/export should be allowed only from predefined folder inside smasch (to prevent overriding/exposing system information)