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]

include/boost/range/algorithm/reverse.hpp

@@ -34,15 +34,6 @@ inline BidirectionalRange& reverse(BidirectionalRange& rng)
     return rng;
 }
 
-/// \overload
-template<class BidirectionalRange>
-inline const BidirectionalRange& reverse(const BidirectionalRange& rng)
-{
-    BOOST_RANGE_CONCEPT_ASSERT(( BidirectionalRangeConcept<const BidirectionalRange> ));
-    std::reverse(boost::begin(rng), boost::end(rng));
-    return rng;
-}
-
     } // namespace range
     using range::reverse;
 } // namespace boost