Progress status

Progress is good on multiple fronts.

- I never managed to make libgc (C++ garbage collector) work with code compiled in release mode (VC2003). I spent some time debugging it without success. Version 7.0 has just been release but the problem is still there. So I had to solve it. I finally found out the cause and made a quick hack for my code to work. The author has been notified and I hope the bug will be definitely fixed in the next release.

- In the mean time I also investigated various cryptographic packages to use for the prototype. There are quite many out there. Openssl is the one I'll pick because it fits best my requirements. But it needs a C++ wrapper that makes its use more simple and convenient as in other C++ cryptographic packages.

- Signed and multi-signed information data encoding format is now finalized. It was not trivial because the requirements were quite tricky to match. Their properties are attractive, but this must still be implemented and tested to validate its usability.