Make it possible to abort skimming of samples to save time

[klieret]

Or give option to run over one sample.

But ideally people should be able to hit ^C and then the fitter only takes the output files that were generated.

[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. Please manually close it, if it is no longer relevant, or ask for help or support to help getting it unstuck. Let me bring this to the attention of @klieret @wdconinc @michmx for now.