Replace old iterator `for` with `do { .. }` expressions in std and extra#8159

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bluss wants to merge 8 commits into

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Commits on Aug 1, 2013

std: Use `do` blocks instead of `for` with .iter_bytes()
blake2-ppc
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extra: Use `do` instead of `for` in extra::iter
blake2-ppc
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std: Replace `for` with `do { .. }` expr where internal iterators are used
blake2-ppc
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extra: Replace `for` with `do { .. }` expr where internal iterators are used
blake2-ppc
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extra: Use external iterators in bitv implementation
blake2-ppc
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std: Remove the internal iterator methods from trait Set
blake2-ppc
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std: Replace `for` with `do { .. }` expr in std::gc
blake2-ppc
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std: Change `Times` trait to use `do` instead of `for`
blake2-ppc
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