add upload config file to recreate an existing cluster

[kaktus42]

It would be good to have a upload field to upload a ???-userdata.txt that you can download upon first creation of a cluster. The cloudlounch then should prefill all the values from the values in that file.

[dannon]

Not sure I follow -- all the data should already be stored in the bucket for subsequent launches. Or are you saying you want a "Launch another like my_clustername"?

[kaktus42]

Well. But when I re-started my cluster, it e.g. chose a different instance type. also the keyfile needs to be specified again, otherwise I can't login on the machine. And for some other options the same