Fix bug: file import function called two times if the loader configuration didn't need any KeyServer interaction.
This resulted from the fact that the hide criteria in the LoginDialog startMode didn't match the criteria in the DatasetView's FileEntryPreImport handler.
Becaus of this criteria the Login dialog indeed appeared (it shouldn't), and at the end of the hide operation handleImportAndSendOperations was issued twice.
That fucntion (handleImportAndSendOperations) alo called from DatasetView;s FileEntryPreImport event handler. Now the LoginDialog doesn't appear, so the hide branch is not activated
and the import handler is called only from one source.
Preparing for file save code. Will use the same filename as it was used for import, I'll just append a random number after the name to make it unique avoiding collisions.