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/cppunit/include/cppunit/config/SelectDllLoader.h

@@ -0,0 +1,76 @@
+#ifndef CPPUNIT_CONFIG_SELECTDLLLOADER_H
+#define CPPUNIT_CONFIG_SELECTDLLLOADER_H
+
+/*! \file
+ * Selects DynamicLibraryManager implementation.
+ *
+ * Don't include this file directly. Include Portability.h instead.
+ */
+
+/*!
+ * \def CPPUNIT_NO_TESTPLUGIN
+ * \brief If defined, then plug-in related classes and functions will not be compiled.
+ * 
+ * \internal
+ * CPPUNIT_HAVE_WIN32_DLL_LOADER
+ * If defined, Win32 implementation of DynamicLibraryManager will be used.
+ * 
+ * CPPUNIT_HAVE_BEOS_DLL_LOADER
+ * If defined, BeOs implementation of DynamicLibraryManager will be used.
+ * 
+ * CPPUNIT_HAVE_UNIX_DLL_LOADER
+ * If defined, Unix implementation (dlfcn.h) of DynamicLibraryManager will be used.
+ */
+
+/*!
+ * \def CPPUNIT_PLUGIN_EXPORT
+ * \ingroup WritingTestPlugIn
+ * \brief A macro to export a function from a dynamic library
+ *
+ * This macro export the C function following it from a dynamic library. 
+ * Exporting the function makes it accessible to the DynamicLibraryManager.
+ *
+ * Example of usage:
+ * \code
+ * #include <cppunit/include/plugin/TestPlugIn.h>
+ *
+ * CPPUNIT_PLUGIN_EXPORT CppUnitTestPlugIn *CPPUNIT_PLUGIN_EXPORTED_NAME(void)
+ * {
+ *   ...
+ *   return &myPlugInInterface;
+ * }
+ * \endcode
+ */
+
+#if !defined(CPPUNIT_NO_TESTPLUGIN)
+
+// Is WIN32 platform ?
+#if defined(WIN32)
+#define CPPUNIT_HAVE_WIN32_DLL_LOADER 1
+#undef CPPUNIT_PLUGIN_EXPORT
+#define CPPUNIT_PLUGIN_EXPORT extern "C" __declspec(dllexport)
+
+// Is BeOS platform ?
+#elif defined(__BEOS__)
+#define CPPUNIT_HAVE_BEOS_DLL_LOADER 1
+
+// Is Unix platform and have shl_load() (hp-ux)
+#elif defined(CPPUNIT_HAVE_SHL_LOAD)
+#define CPPUNIT_HAVE_UNIX_SHL_LOADER 1
+
+// Is Unix platform and have include <dlfcn.h>
+#elif defined(CPPUNIT_HAVE_LIBDL)
+#define CPPUNIT_HAVE_UNIX_DLL_LOADER 1
+
+// Otherwise, disable support for DllLoader
+#else
+#define CPPUNIT_NO_TESTPLUGIN 1
+#endif
+
+#if !defined(CPPUNIT_PLUGIN_EXPORT)
+#define CPPUNIT_PLUGIN_EXPORT extern "C"
+#endif // !defined(CPPUNIT_PLUGIN_EXPORT)
+
+#endif // !defined(CPPUNIT_NO_TESTPLUGIN)
+
+#endif // CPPUNIT_CONFIG_SELECTDLLLOADER_H