separating includes: tr1 from c++0x

[Paolo Carlini]

... the below is what I eventually committed, tested x86_64-linux
multilib, also without PCHs and also -O2 -g -Wall.

Benjamin, I also tried at once to fixup most of the missing
_GLIBCXX_BEGIN_NAMESPACE and _GLIBCXX_END_NAMESPACE, please double check
what I have done, hopefully much less remains to be done for the
namespace versioning issue...

Paolo.

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