added cppunit unit testing framework, using cmake, stripped out the original build systems.

added starting point for Bullet unit tests, with one example unit test
Enable the option BUILD_UNIT_TESTS in cmake to build the test. Note that the test doesn't automatically run.

UnitTests/BulletUnitTests/Main.cpp

@@ -0,0 +1,38 @@
+#include <cppunit/BriefTestProgressListener.h>
+#include <cppunit/CompilerOutputter.h>
+#include <cppunit/extensions/TestFactoryRegistry.h>
+#include <cppunit/TestResult.h>
+#include <cppunit/TestResultCollector.h>
+#include <cppunit/TestRunner.h>
+
+#include "TestBulletOnly.h"
+
+CPPUNIT_TEST_SUITE_REGISTRATION( TestBulletOnly );
+
+int main(int argc, char* argv[])
+{
+  // Create the event manager and test controller
+  CPPUNIT_NS::TestResult controller;
+
+  // Add a listener that colllects test result
+  CPPUNIT_NS::TestResultCollector result;
+  controller.addListener( &result );        
+
+  // Add a listener that print dots as test run.
+  CPPUNIT_NS::BriefTestProgressListener progress;
+  controller.addListener( &progress );      
+
+  // Add the top suite to the test runner
+  CPPUNIT_NS::TestRunner runner;
+  runner.addTest( CPPUNIT_NS::TestFactoryRegistry::getRegistry().makeTest() );
+  runner.run( controller );
+
+  // Print test in a compiler compatible format.
+  CPPUNIT_NS::CompilerOutputter outputter( &result, CPPUNIT_NS::stdCOut() );
+  outputter.write(); 
+
+  getchar();
+
+  return result.wasSuccessful() ? 0 : 1;
+}
+