Boost.Range merge from trunk to release.

This is motivated by the need to correct the istream_range, to correct the adaptors.hpp header file, and correct the return types of various range algorithms.

[SVN r61517]

test/algorithm_test/for_each.cpp

@@ -83,4 +83,4 @@ init_unit_test_suite(int argc, char* argv[])
     test->add( BOOST_TEST_CASE( &boost::test_for_each ) );
     
     return test;
-}
+}