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Breaks API again, but only for errors (I believe... return types have
become more specific, not less);

0.4

See merge request !35

See the previous commit for caveats on this release. More info in the
tag.

Several peripheral API changes here ramping up to the 0.4.0 release.
- The `All::remove_by_*` functions now return booleans indicating if the
  gruser was removed or not.
- User and Group no longer implement display for use in passwd/shadow
  file serialization; the implementations have moved to private
  functions.
- Parse errors now return a line number (only the line number! Don't
  leak the file contents).
- Invalid lines are no longer ignored during passwd/group file parsing.
  This has potential to cause breakage but I'd estimate that to be a
  pretty small risk. It does now report any parse errors.

Essentially just make the tests pass. Enabling locks on linux causes
deadlocks in the tests (even when running single-threaded?), so I need
to look at that some more.

This also includes a couple of documentation combing things, there will
be another commit to follow this up.

This compiles, but I think the tests are deadlocking somehow, even with
an unlock being called explicitly in the AllGroups drop. More work is
needed to make this work.

Uhg.

- `FromStr` is no longer used for /etc/group parsing
- All the structs in this crate will debug print correctly
- Trailing whitespace/empty user lists for /etc/group entries are now
  parsed correctly. Tests added for those cases as well.

I never liked how I had to pass around a bool and ensure that the user
had used the API correctly and panic if they hadn't. This commit adds a
marker type to `User` and `AllUsers` that ensures that a user of the
library cannot use authentication and other password related methods
unless they've instantiated the user with authentication information.

Got rid of the tests that ensured panics for incorrect usage of the API;
incorrect API use is a compile-time error now.

I removed `FromStr` for `User` and added it as a private method, later
commits will do the same for `Group` and possibly transition away from
`Display`.

Documentation in the works.

Resolves #26.

Since dirs is a reverse dependency of this crate and is used an awful
lot, it's nice to have as small a dependency footprint as possible. dirs
doesn't need the authentication stuff so we can drop a large number of
deps. I imagine this will probably be useful in other contexts as well.

Bump rust-argon2 dependency

Closes #30

See merge request !34

Bump rust-argon2 dependency to 0.7

See merge request !33

Switch from rand_os crate to getrandom

See merge request !32

This extracts part of !30 into it's own PR. getrandom has a smaller dependency footprint, and the version of rand_os being used was quite out of date.

v3.0

See merge request !26

I think we're ready to merge, I'm happy with the state of the code and
the state of the docs. I'd like to majorly refactor before a 1.0.0
release, but this is just fine for now.

Replace rand 0.5 with rand_os 0.1

See merge request !27

redox_users only uses the OsRng struct which has been moved to the
rand_os crate.

Basically takes advantage of the configuration struct.
The tests still fail and I still don't know why.

For some reason that I cannot ascertain, two tests still fail. I have
examined values basically everywhere and cannot figure it out. User and
Group get Debug now though.

The tests still don't pass, but this is a big step. Solves #23.