Remove rust_unwind.h

Adds the required definitions in the correct place.
Merge branch 'incoming' of git://github.com/mozilla/rust into unwind-fix
Add basic documentation for with_capacity
Move documentation for vec::windowed where it will be generated
Rename vec::mod2 to vec::mod_zip
rt: pull upstream ISAAC code for consistency between 32/64 bit platforms

The "unsigned 4 byte" `ub4`s are actually 8 bytes on 64-bit platforms
which mean that some bits > 2**32 were retained in calculations, these
would then "reappear" after a shift and so the stream of random numbers
would differ on 32 bit vs 64 bit platforms.
Made fail! and assert! accept both &'static str and ~str, as well as a fmt! like format list.

Unwinding through macros now happens as a call to the trait function `FailWithCause::fail_with()`, which consumes self, allowing to use a more generic failure object in the future.
implement Ord, TotalEq and TotalOrd for char

Closes #6063
Add is_zero method to Zero
auto merge of #6055 : cmr/rust/incoming, r=graydon,brson
Allow customization of indent offset
Use `///` doc-comment form instead of `/** */`
Minor style improvements for test functions

Use argument pattern-matching for test_division_rule and remove visibility specifier for test_signed
Add Bitwise, Bounded, Primitive, and PrimitiveInt traits
Add Int, Uint and Float traits for primitive numbers
Add BitCount trait
Fix failing test
Added test cases for all fail message formats
Offer a hint on some unresolved imports

I didn't know how to use "use" initially, and an error message like this would
have solved quite a bit of frustration. I think this properly handles cases
where it's not appropriate but I'm not sure.
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