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/TODO

@@ -0,0 +1,35 @@
+* Bugs:
+Asserter::makeNotEqualMessage() strip the shortDescription of the additional message.
+
+* CppUnit:
+  - STL concept checker.
+  - Memory leak tracking: setUp/tearDown should be leak safe if no failure occured.
+
+* UnitTest
+  - add tests for XmlOutputter::setStyleSheet (current assertion macro strip <?...> when
+    testing )
+
+* VC++ TestRunner:
+  - Modify MfcUi::TestRunner to expose TestResult (which allow specific TestListener
+    for global initialization).
+  - Update MfcTestRunner to use TestPath to store test in the registry
+    
+* Documentation:
+	CookBook:
+	- how to create simple test cases (with CppUnit namespace)
+	  - test case using only CPPUINT_ASSERT
+	  - test case using CPPUNIT_ASSERT_EQUAL
+	  - advanced assertions with the CPPUNIT_ASSERT_MESSAGE
+	- Helper Macros for convenience
+	- Creating a suite
+	- Composing a suite from more suites (i.e. compose tests for n modules to
+	  form a big test for the whole program)
+	- customizing output using an user defined TestListener
+	  - how to write the TestListener (subclass of TestListener)
+	  - how to hook it in
+	- how to use the GUI
+	  - MSVC++ special stuff
+	- other custmization stuff I haven't understood yet
+
+	CppUnit: architecture overview.
+