[boost] [optional_io] Request permission to merge simple fix to optional extraction operator

Hi All, It was brought to my attention that extracting an *empty* optional<> from a stream using the default provided operators (in optional_io.hpp), leaves one character behind, preventing any further extraction. This is clearly a bug so I can only guess that no one is using it (except for the user that reported it). The fix is quite trivial: https://svn.boost.org/trac/boost/changeset/64206 And I've updated the test accordingly to make sure it works. Can I marge the fix into the release branch? TIA --- Fernando Cacciola SciSoft Consulting, Founder http://www.scisoft-consulting.com