[Patch] Start splitting out the facets

[Paolo Carlini]

Hi,

the below starts on the idea, mentioned a few days ago, of splitting the 
large locale_facets to separate files, in order to minimize the size of 
the iostreams headers. As is, removes about 70 KB of unused code from 
the pre-processed <ios>, <iostream>, <fstream>, ... Of course further 
tweaks seem possible, finer grained splits, etc, but we want to proceed 
incrementally, to be safe. Benjamin, looks good to you? Other proposals 
for the names of the new files?

Tested x86_64-linux, without PCHs, both locale models.

Paolo.

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