[Patch] More facets rearrangements

[Paolo Carlini]

Hi,

this one is only partially about size of the headers (~ 10 KB off 
<iostream>) and mostly about consistency and correctness: it adds a 
locale_classes.tcc hosting the out of line functions of class locale; 
moves collate to the locale_classes headers, to support instantiating 
locale::operator() also when locale is not explicitely mentioned by the 
user (*); changes locale_facets to not include <bits/codecvt.h>, instead 
in fstream, where it's used, and in locale_facets_nonio (which finally 
hosts *only* things not having to do directly with iostreams).

Tested x86-linux without PCHs.

Paolo.

(*) Like:

#include <string>
#include <streambuf>

class my_sb
: std::streambuf
{
public:
  my_sb()
  { }

  void
  f()
  { std::streambuf::getloc()(std::string(), std::string()); }
};

int
main()
{
  my_sb sb;
  sb.f();
}

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