[1611376]writer now escapes special characters. When no special chars are present, old behavior is retained. New method might have a performance penalty b/c of operator new inside std::string. (This would not exist if the whole thing operated on ostream instead, I think.)

src/lib_json/json_reader.cpp

@@ -560,6 +560,7 @@ Reader::decodeString( Token &token, std::string &decoded )
                if ( !decodeUnicodeEscapeSequence( token, current, end, unicode ) )
                   return false;
                // @todo encode unicode as utf8.
+	       // @todo remember to alter the writer too.
             }
             break;
          default: