Setting the region name is not working properly

1. When I run climpact for one region only, the attribute region says all instead of the region that I have selected
2. When the attribute "path_prefix" is set (line 379 in ProcessClimateData.py), an underscore is missing between the filename and the region (result.attrs["path_prefix"] = file_name + region). In my case it resulted in ProcessedModelData-nukleus-ceu-3-hurs_tas_tasmax_tasmin_pr_prhmax_sfcwind_sfcwindmaxall, so scfwindmax and all should be separated