[C++-sig] injected constructors

[David Abrahams]

Injected constructors are implemented, but not yet documented.  See
libs/python/test/injected.[py/cpp] for examples.

There have also been some changes to the concept requirements for
CallPolicies which have not yet been documented.  If you have
problems with your custom-made policies with the current CVS state,
please let me know.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com