RTT 2.0 & Windows & CORBA

I've managed to get all the unit tests working (except parser-test) and
the CORBA transport layer usable under windows.

The patches are available on github (branch rtt-2.0-mainline) :

In a nutshell:
* Some "program" tests (program-test, state-test) were broken due to
inaccurate timer functions. parser-test still raises the same exception as
* Due to some windows weirdness with the Winsock includes and ACE, I
used the win32.h file to try to include some headers as earlier as possible