Merge from trunk.

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  r66075 | chris_kohlhoff | 2010-10-18 23:27:12 +1100 (Mon, 18 Oct 2010) | 2 lines
  
  Fix unused parameter warnings.
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  r66143 | chris_kohlhoff | 2010-10-22 23:07:36 +1100 (Fri, 22 Oct 2010) | 2 lines
  
  Redefine Protocol and id to avoid clashing with Objective-C++ keywords. Fixes #4191.
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  r66144 | chris_kohlhoff | 2010-10-22 23:20:52 +1100 (Fri, 22 Oct 2010) | 2 lines
  
  Version check not required.
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  r66156 | chris_kohlhoff | 2010-10-24 11:26:10 +1100 (Sun, 24 Oct 2010) | 2 lines
  
  Fix for IBM C++ compiler.
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  r66158 | chris_kohlhoff | 2010-10-24 13:06:46 +1100 (Sun, 24 Oct 2010) | 2 lines
  
  Fix vector reallocation performance problem. Fixes #4780.
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  r66159 | chris_kohlhoff | 2010-10-24 18:58:23 +1100 (Sun, 24 Oct 2010) | 2 lines
  
  Fix kqueue_reactor so that it compiles on NetBSD. Fixes #4662.
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  r66162 | chris_kohlhoff | 2010-10-25 00:15:46 +1100 (Mon, 25 Oct 2010) | 2 lines
  
  Fix failure in socket_base test on NetBSD.
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[SVN r66173]

libs/asio

@@ -1 +1 @@
-Subproject commit 81a5e3660d789c98df1e4fee2fde755425897148
+Subproject commit 727a5c75a304a919236700aa635dd968129a4f89