Update boost to 1.71 and add asio

boost/date_time/special_defs.hpp

@@ -0,0 +1,25 @@
+#ifndef DATE_TIME_SPECIAL_DEFS_HPP__
+#define DATE_TIME_SPECIAL_DEFS_HPP__
+
+/* Copyright (c) 2002,2003 CrystalClear Software, Inc.
+ * Use, modification and distribution is subject to the 
+ * Boost Software License, Version 1.0. (See accompanying
+ * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ * Author: Jeff Garland 
+ * $Date$
+ */
+
+namespace boost {
+namespace date_time {
+
+    enum special_values {not_a_date_time, 
+                         neg_infin, pos_infin, 
+                         min_date_time,  max_date_time,
+                         not_special, NumSpecialValues};
+
+
+} } //namespace date_time
+
+
+#endif
+