Move to use semantic module organisation

[vgvassilev]

When we install boost we copy all header files in an include folder. This way some of the layering information about physical header-module relationship is lost.

Our scripts should take into account the header file location from the source tree of boost. There are header-dependencies tools such as that one. Eg:

boostdep --track-sources thread

algorithm:
    <boost/algorithm/string/split.hpp>
        from <libs/thread/src/pthread/thread.cpp>
    <boost/algorithm/string/trim.hpp>
        from <libs/thread/src/pthread/thread.cpp>

There are a set of headers which were moved to other location but a forwarding header for backward compatibility is left. Eg core_addressof and utility_addressof. This file contains some exceptions which are not in the expected (from their name) module.

Hints kindly provided by @pdimov.