[Patch] Initial bits of tr1/type_traits

[Paolo Carlini]

Hi everyone,

finally I can devote some time to this *interesting* project!

The below would be only an initial skeleton, which adds a bit of
infrastructure and is supposed to get reasonably right only:

    is_void
    is_integral
    is_floating_point
    is_array

and the composite type traits as per 4.5.2.

I'd like to check it in and continue from here, if nobody spots
something obviously wrong, of course...

Regtested x86-linux.

Paolo.

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