More fun with python and swig

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Hello, Happy new year!

I have added support for protocol buffer as in/out parameters of python methods.
This is really tricky, You can have a look at this change if you are interested.

The undesired effect is that you have to install the protocol buffer python package.
The cleanest way is to run make install_python_modules again.

or

cd dependencies/sources/protobuf-512 (on unix) or cd dependencies\sources\protobuf on windows
python setup.py build
python setup.py test (optional)
python setup.py install --user (or python setup.py install if you have root/administrator privileges).

The real downside is that it breaks my previous attempt at python 3.3 compatibility as the protobuf python package breaks even after running 2to3 on it.

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