[v3] Remove uses of <cstddef> as an implementation detail

[Paolo Carlini]

Hi,

this, largely boring patch essentially does what the Subject says, thus
following the spirit of LWG 1250, avoiding uses of C-style NULLs,
trimming the size of the C++ headers. I took also the occasion to add
std::nullptr_t, in C++0x mode.

Tested x86_64-linux, without PCHs, multilib, committed to mainline. I'm
of course around in case of breakages on other targets...

Paolo.

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