[patch] : RFC : rvalue / move symantics

[Chris Jefferson]

Hello!

While I still have some other things to finish cleaning, up I thought 
I'd send out this simple patch that adds move symantics to std::vector 
and std::unique, for any comments before untakeing adding the symantics 
to all the other containers / algorithms. This patch looks an awful lot 
like N1770 and N1771, recently posted papers to www.open-std.org about 
rvalue references, which isn't suprising as it was somewhat based on an 
old one. I've designed so that if and when rvalue symantics are added to 
the compiler, a simple(ish) search-and-replace will move us to the 
behaviour of N1770 and N1771.

This patch (of course) implements a relatively small amount of the work 
in these patches.

For those interested in reading the code, some brief things I came 
across while designing..

Why not allow __rvalrefs to decay back into normal references?
This might be added later. I didn't want to add it yet because there 
should be no reason for that to ever occur at present, so if it does 
it's because either a) a move got added where one can't be, or b) some 
class is marked as moveable when it shouldn't be.

Also, it would be nice if I could just mark all classes as moveable and 
then have the __rvalrefs decay to normal references when the class isn't 
rvalue aware. Unfortunatly this is defeated by templated constructors...

Chris
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