Make purging of folder optional / or note when downloading
Set data folder when loading page as would do when downloading slots! (otherwise, an upload of the slots from a previous run, which was not uploaded, is not possible)
make uploading / json parsing error proof -> catch exception to avoid crashing of the app -> display error messages
allow the gui to start even with empty accounts.pwd
create (by default) a folder within the data folder that replicates the source-domain