Inheritance code

I just checked the initial inheritance code in, it's just the inheritance code
from boost.python made into a singleton. No graph or cache data is shared
between modules at this point.

The relevant files are:

   boost/langbinding/inheritance.hpp
   libs/langbinding/inheritance.cpp
   libs/langbinding/inheritance_instance.cpp

The jamfile that builds this would look something like:

dll langbinding
    : inheritance.cpp
    :
    ;

lib langbinding-static
    : inheritance_instance.cpp
    :
    ;

I've plugged parts of this in luabind, but there are additional issues with our
holders that's preventing me from finishing it up.

---
Daniel Wallin



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