std::string overloads for xfstream

[Ed Smith-Rowland]

Hi,

This little tidbit provides the C++-0X std::string overloads for fstream 
and friends.  This makes it so you don't need name_string.c_str() to 
open a file.

There is another piece to this involving the C++-0X rework of 
ios_base::failure but that issue is deeper and will follow in another 
patch when I can get it working.  It would also benefit from completion 
of std::system_error from which it now derives.

We generally know about the big bits of C++-0X and are making rapid 
progress.  But there are probably lots of crumbs like this one that are 
not captured in the status pages.  (e.g. I know that valarray needs the 
rvalue swap method and namespace swap functions and rvalue ctors and 
assigns).  I'll work from the bottom up compiling a list of these 
tidbits.  If anyone else has noticed missing things or knows of a 
fine-grained diff w.r.t. 2003 that would be really helpful.

Ed Smith-Rowland

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