[racket-dev] added function to srfi-19....

It was driving me crazy that srfi-19 had no way to convert seconds to times, especially given the fact that it appears that the internal representation used by srfi 19's time-utc was the result of (current-seconds).... so I added seconds->time-utc and time-utc->seconds, along with test cases.

Unfortunately, I have no obvious way of documenting them. Let me know if there's a way I should be documenting this, or if it's a bad idea to extend the interface like this.

John Clements

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