Add last_clean_details to return information from the last clean #395
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Reasoning: sometimes it is useful to get information from the last clean up (e.g. its start time for UIs). Furthermore, as far as I know one is getting always details for a single cleaning, so there's no need to keep it wrapped in a list, simplifying the downstream usage. In case there are multiple details, a warning is printed out so we can adjust this if need to be.
This involves also refactoring clean_details() to return the results unwrapped.
For the time being the default behavior will remain the same as it was (wrapped),
but a deprecation warning will be raised.
I'm expecting that we can flip the toggle after a while, and remove the warning
at that point, too.