[v3 patch] Add std::tr1::shared_ptr

[Paolo Carlini]

Jonathan Wakely wrote:

>I expect there will be plenty of changes to come but this should
>probably be committed now and improved later.
>
Probably. But it's the first time that we are seeing this code and, sorry,
I find a little bit unpolite creating CVS dirs before any discussion... Or
maybe a libstdc++-v3 maintainer approved that off-line?!?

Thanks,
Paolo.