Add <initializer_list> to stdc++.h and ruminations on aggregation headers

[Ed Smith-Rowland]

All,

I was looking at Bjarne Stroustrups proposal n2905.pdf for aggregation 
headers and looking at our own in precomp.

His std-all is basically our stdc++.h except that the latter doesn't 
have <initializer_list>.  I know it really is in there but I thought it 
might be nice to put it in there explicitly for forms sake.  See the 
patch and changelog.

Also attached are simple implementations of std-all and std-checked to 
play with and some toy drivers.

In particular, is there anything we could add to std-checked that 
libstdc++ checks?
Maybe if someone, say, includes <vector> and then includes <std-checked> 
we should yell because (unless they threw the debug flag on the command 
line) they won't get the range checking.

We could add an ext-all.

Naturally, these would be candidates for user pch.

Of course these aggregation headers are not in the std yet ;-).  These 
are just to think about.

But the patchlet adding <initializer_list> to stdc++.h is bootstrapped 
and regtested on powerpc-apple-darwin7.9.0.

Ed

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