Subject: More refinements required in sender.c

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I made a not so clever "assumption" in that I could simply
ignore rps_close() without adverse consequences.  In fact
there are extreme adverse consequences that are especially
apparent with SMALL INPUT FILES.

This problem can be eliminated by putting a sleep(10); at
the end of sender.c as I have now down.

Exercise:  Explain exactly why things fall apart without
the sleep()