Moved smart_ptr contents to subdirectories, switched to a local test/Jamfile.

[SVN r17042]

example/shared_ptr_example2.cpp

@@ -0,0 +1,19 @@
+// Boost shared_ptr_example2 implementation file  -----------------------------//
+
+#include "shared_ptr_example2.hpp"
+#include <iostream>
+
+class example::implementation
+{
+ public:
+  ~implementation() { std::cout << "destroying implementation\n"; }
+};
+
+example::example() : _imp( new implementation ) {}
+example::example( const example & s ) : _imp( s._imp ) {}
+
+example & example::operator=( const example & s )
+  { _imp = s._imp; return *this; }
+
+void example::do_something()
+  { std::cout << "use_count() is " << _imp.use_count() << "\n"; }