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Version History:

 1.1 1996-01-01 adds new address and phone number.

 1.2 1996-01-01 puts HeapSort into a package.

 1.3 1998-12-28 compatible with the JDK1.2 Comparator/Comparable interface.

 1.4 1999-01-01 made TestHeapSort part of the standard package, added note on invoking it.

 1.5 1999-01-01 uses the java.util.Comparator interface by default

 1.6 2002-03-30 tidy code.

 1.7 2008-01-01 add generics to Comparator

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