Add support for additional frames storing sensors position, use it to compute HRP-2 camera positions.

    This reverts commits 33671f54 and
    52fdc8e5.

    These commits introduce a bug in the generation of python modules:
    shared objects wrap.so have been renamed but __init__.py files still try
    to import them with the old name.

Remove the command MAKE_DIRECTORY that has been moved in python.cmake

    - correct the mkdir command to make it cross-platforms
    - remove the '/' in the module name (forbidden in win32 systems)