Add `getpwnam` and related functions#864

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ctrlcctrlv wants to merge 17 commits into

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Commits on Aug 19, 2019

Add `Users` and `Group` related functions
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Commits on Aug 20, 2019

Commits on Aug 21, 2019

Use MaybeUninit
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Commits on Aug 28, 2019

Improve `from_anything` definition using where clause
otavio
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Commits on Sep 4, 2019

Add a generic reserve_buffer_size method
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Commits on Sep 5, 2019

Commits on Sep 11, 2019

Commits on Sep 21, 2019

Rework getgroups() according to @asomers suggestions
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