Minimal supported library subset

[alabuzhev]

Documentation says that including format.h and format.cc should be enough, but format.cc also includes printf.h and printf.h includes ostream.h.
I've experimented a little, looks like #include "printf.h" in format.cc required only for explicit instantiations of PrintfFormatter for char and wchar_t.
Maybe it's possible to move them to printf.cc?
Do you have any plans to make format.h/cc self-contained?
If no - it's probably worth to update the docs.

[vitaut]

Good catch, there indeed should be printf.cc and format.cc shouldn't be including printf.h.