More cleanups and enable some more compiler lints#837

Merged

bors[bot] merged 14 commits intonix-rust:masterfrom Susurrus:lints

Jan 31, 2018

+175-143

Commits on Jan 28, 2018

Deny unused qualifications
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Prevent the use of unstable compiler features
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Disallow unnecessary import braces
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Implement Copy/Clone for all types missing it
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Commits on Jan 29, 2018

Replace sockaddr_ctl with one from libc
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Require Debug impls for all types
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Deny missing docs for pty module
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Require docs for the poll module
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Require docs for the net/if_ module
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Require docs for features and ifaddrs module
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Clean up imports and uses in lib.rs
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Alphabetize modules under /sys
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Fix B460800 and B921600 baud rates for netbsd
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Fail to compile for any unused code
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