Merge from trunk r75937

* fixed a lot of wchar_t errors
* Optimizations for boost::containers::basic_string
* More tests

[SVN r76062]

test/lexical_cast_empty_input_test.cpp

@@ -49,7 +49,7 @@ void test_empty_string()
 
 unit_test::test_suite *init_unit_test_suite(int, char *[])
 {
-    unit_test_framework::test_suite *suite =
+    unit_test::test_suite *suite =
         BOOST_TEST_SUITE("lexical_cast. Empty input unit test");
     suite->add(BOOST_TEST_CASE(&test_empty_iterator_range));
     suite->add(BOOST_TEST_CASE(&test_empty_string));