PrintCsyntax, PrintAsm: improve printing of float literals.


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- Revised memory model with concrete representation of ints & floats,
  and per-byte access permissions
- Revised Globalenvs implementation
- Matching changes in all languages and proofs.


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Function types didn't always degrade to pointers like they should.  Introduced and used Csyntax.typeconv to address this issue and reduce the number of cases in the classify functions

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Introduced Int.iwordsize and used it in place of "Int.repr 32" or
"Int.repr (Z_of_nat wordsize)".



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  #pragma use_section.
Some clean-ups in Cil2Csyntax.
Separate mach-dep parts of extraction/extraction.v into
   <arch>/extractionMachdep.v


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