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/THANKS

@@ -0,0 +1,23 @@
+Tim Jansen <timj@systembureau.com>
+Christian Leutloff <leutloff@debian.org>
+Steve M. Robbins <smr@sumost.ca>
+Patrick Berny <PPBerny@web.de>
+Patrick Hartling
+Peer Sommerlund
+Duane Murphy <duanem@users.sourceforge.net>
+Gigi Sayfan <gigi@morphink.com>
+Armin "bored" Michel <bored@sourceforge.net>
+Jeffrey Morgan <kuzman@zoominternet.net>
+'cuppa' project team (http://sourceforge.jp/projects/cuppa/)
+Phil Verghese <philv@users.sourceforge.net>
+Lavoie Philippe <lavoie@yukon.genie.uottawa.ca>
+Pavel Zabelin
+Marco Welti <Welti@GretagMacbeth.ch>
+Thomas Neidhart
+Hans B<>hler <hans.buehler@topmail.de> (Dynamic Window library used by MFC UI)
+John Sisson
+Steven Mitter <smitter@iicm.tu-graz.ac.at>
+Stephan Stapel <stephan.stapel@web.de>
+Abdessattar Sassi <abdesassi@users.sourceforge.net> (hp-ux plug-in support)
+Max Quatember and Andreas Pfaffenbichler (VC++ 7 MFC TestRunner go to source line)
+Vincent Rivi<76>re