Fetter

Implemented variable-width and colored terminal displays.

Implemented terminal spinner for long-running commands.

Added `purge-invalid` and `purge-pattern` commands.

Split `unpack` command into `unpack-count` and `unpack-files`.

Added support to specify `--bound` with a git repository.

Added `--user-site` flag to force inclusion of user site packages; otherwise, user site packages are only included if `ENABLE_USER_SITE` is set.

Reimplemented display and delimited table outputs to use a generic trait implementation.

Support `--requirement` in requirements files.

Package and DepSpec comparisons now remove user.

Package and DepSpec comparisons now accept matching either on requested_revision or commit_id.

URLs are now shown in DepSpec displays.

Delimited file output no loner pads spaces.

Validate display now shows paths properly.

Updated validate json output to terminate line and flush buffer.

Package and dependency keys are case insensitive.

Improved URL validation between dependency and package by removing user components.

Improved validation JSON output to provided labelled objects.

Improved valiation output to show sorted missing packages.

Renamed validation explain values.

Implemented support for nested requirements.txt.