Fix up the swap request message to use the new slothd info. Now it says
how long they've been idle and what the time of last activity was on their nodes. And now do proper wordwrapping on the message instead of static apriori newline placement. Also add the ability to do some formatting on the idle time to those functions, and use it to make the swap request message a little better. ("H hours, M minutes" instead of "X.Y hours").
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