CppUnit - C++ port of JUnit Code

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Note that CPPUNIT_ASSERT_DOUBLES_EQUAL handles non-finite numbers.

Make sure that CPPUNIT_ASSERT_DOUBLES_EQUAL() properly handles
non-finite values.

Add unit tests for CPPUNIT_ASSERT_DOUBLES_EQUAL() that test with
non-finite values.

Account for non-finite values in assertDoubleEquals().

Conditional inclusion of cmath rather than math.h removed since (1) it
was never used as HAVE_CMATH is never defined, and (2) cmath may move
isfinite() into namespace std.

Check for isfinite() and finite().

New autoconf macro to test for isfinite() in C++ mode.

Update email address of Steve M. Robbins

Arrange class initializers in correct order.

Ensure virtual class has virtual destructor.