This module provides feature-specific implementations, and also dummy implementations for when they aren't supported by the system or OS.

Doing it this way limits all the #[cfg(feature)] annotations, as we can now just include the module or not.

- Changes to users crate

- old_path::Path isn't imported by default anymore
- range -> ..

The path_filename function/method isn't declared public. If the declaration is changed, rustc complains about a conflict. This seems to be the minimal change needed for tests to run.

Add "`--group` is useless without `--long`"

Make Git Column Optional

Closes #47

making Exa.load() stat files in parallel

- env is no longer feature gated
- exit_status is!

This stops the openssl-sys version clash preventing exa from compiling.

current_dir returns a new PathBuf, but getcwd returns an old Path. One day I'll have to upgrade to the new Path library. One day.

Fixes #41.

Add PKGBUILD to contrib

Closes #27.

So move it as part of 'recurse's option.

Move most of the heavy lifting into a Table struct, which doesn't govern how the resulting table is *created*, only how it's *displayed*.