[v3] policy based associated containers

[Paolo Carlini]

Hi Ulrich,

>I gather this should be (PB_ASSOC_CLASS_C_DEC::size_type)1 instead of 1 ...
>  
>
Thanks. Are you willing to prepare and regtest the obvious fix on your
64-bit machines?

Thanks again,
Paolo.

P.S. Actually, you need a typename in front of the class name and would
be nice if you could reformat everything to 80 columns (see also the
previous definition)