Log to file option

[rejeep]

Add option prodigy-save-process-output-to-file that tells is the process output should be logged to file or not. Possibly allow this value to be t for default location to save files (~/.emacs.d/.prodigy) or a string specifying the location.

Also allow to specify this per service:

(prodigy-define-service
  :name "foo"
  :save-process-output-to-file t
  )

[shosti]

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