Merge from trunk:
* Chrono support.
* Added object_handle support.
* Need to enable the basic_handle class when object_handle is supported.
* Update copyright notices.
* Fix MSVC "performance warning".
* Fix for NetBSD. Fixes #6098.
* Fix regression in buffered_write_stream. Fixes #6310.
* Fix deadlock on Mac OS X. Fixes #6275.
* On linux, connect can return EAGAIN in certain circumstances. Remap to another
error so that it doesn't look like a non-blocking operation. Fixes #6048.
* Fix non-paged pool "leak" on Windows when io_service is repeatedly run without anything to do. Fixes #6321.
* Disable object_handle on Windows CE.
* Add extra include required for OVERLAPPED struct.
* Fix doxygen comments.
* Update documentation.
* Add missing class.
* Update copyright year.
[SVN r76516]
Christopher Kohlhoff