BIND 10 trac2144-2, updated. 19cc1042a64572001033b7939feadff480661495 [2144] added the boost copyright notice as it's mostly a copy of boost impl.

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- Log -----------------------------------------------------------------
commit 19cc1042a64572001033b7939feadff480661495
Author: JINMEI Tatuya <jinmei at isc.org>
Date:   Tue Mar 26 14:30:08 2013 -0700

    [2144] added the boost copyright notice as it's mostly a copy of boost impl.
    
    also clarify the rationale of the separate namespace for the class.

-----------------------------------------------------------------------

Summary of changes:
 src/lib/util/nonassignable.h |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

-----------------------------------------------------------------------
diff --git a/src/lib/util/nonassignable.h b/src/lib/util/nonassignable.h
index 87e4386..6384f23 100644
--- a/src/lib/util/nonassignable.h
+++ b/src/lib/util/nonassignable.h
@@ -12,14 +12,18 @@
 // OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 // PERFORMANCE OF THIS SOFTWARE.
 
-/// From boost/noncopyable.hpp
+// This implementation is a trivial variation of boost::noncopyable.
+//
+//  (C) Copyright Beman Dawes 1999-2003. Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
 #ifndef UTIL_NONASSIGNABLE
 #define UTIL_NONASSIGNABLE
 
 namespace isc {
 namespace util {
-namespace nonassignable_ {
+namespace nonassignable_ {      // protection from unintended ADL
 
 class nonassignable {
 protected: