Boost unit-testing framework.

make -f makefile.{unix,osx,mingw} test_bitcoin
to compile dumb, do-almost-nothing placeholder unit tests.

src/test/test_bitcoin.cpp

@@ -0,0 +1,6 @@
+#define BOOST_TEST_MODULE uint160
+#include <boost/test/unit_test.hpp>
+
+#include "uint160_tests.cpp"
+#include "uint256_tests.cpp"
+