get_error_info returns raw pointer instead of shared_ptr (breaking change)

diagnostic_information can now be called with boost::exception or std::exception object.
BOOST_THROW_EXCEPTION can now be used even if exceptions are disabled.
added functions: current_exception_diagnostic_information, current_exception_cast
documentation updated to match.

[SVN r52225]

test/no_exceptions_test.cpp

@@ -0,0 +1,40 @@
+//Copyright (c) 2006-2008 Emil Dotchevski and Reverge Studios, Inc.
+
+//Distributed under the Boost Software License, Version 1.0. (See accompanying
+//file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#define BOOST_NO_EXCEPTIONS
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/exception/info.hpp>
+#include <boost/exception/diagnostic_information.hpp>
+#include <boost/detail/lightweight_test.hpp>
+#include <stdlib.h>
+
+struct my_exception: boost::exception, std::exception { };
+typedef boost::error_info<struct my_tag,int> my_int;
+
+bool called=false;
+
+namespace
+boost
+    {
+    void
+    throw_exception( std::exception const & x )
+        {
+        called=true;
+        std::string s=boost::diagnostic_information(x);
+        std::cout << s;
+#ifndef BOOST_NO_RTTI
+        BOOST_TEST(s.find("my_tag")!=std::string::npos);
+#endif
+        }
+    }
+
+int
+main()
+    {
+    BOOST_THROW_EXCEPTION( my_exception() << my_int(42) );
+    BOOST_TEST(called);
+    return boost::report_errors();
+    }