Simplify printing package operations

* get-poetry.py fallback to standard executables

* documentation update

* fix typo due to cleanup

* favor python3 over python2 when creating launcher

* launcher favors 3.5 and up, else the first valid one it finds.

* favor any py3 over py2, not just 3.5+

Co-authored-by: Jonathan Piché <jpiche@coveo.com>

* Add a --keep-untracked option to the install command.

* Call the option --remove-untracked instead.

* Add test and fix Installer.

* Add documentation.

* Make sure to never remove essential packages like pip, setuptools and the root.

* Move logic to the Solver instead.

* Add a few unit tests for Solver.

* Add type hints to solver.py.

Co-authored-by: Steph Samson <hello@stephsamson.com>

* Run black after commit fron Github.

* Import the identifiers used in type annotations.

Co-authored-by: Steph Samson <hello@stephsamson.com>

Moving to tox to use isolated buids to avoid some environment specific
dragons in relation to `poetry install` command. Today, the symlinks
will cause issues when poetry attempts to add an editable install into
the venv due to a pathlib2 bug.

This change brings together logic repeated in various places to
discover package information.

Update `get-poetry.py` to take a flag that allows not setting the path when run non-interactively.

The extras constraints ordering is not guaranteed
on metadata and it causes changes on poetry.lock
file during update process even when the dependency
did not changed.

This patch orders this constraint for lock file
generation changing this behaviour.

The option is similar to the --lock option in the `update`
command, and is useful for cases when the subsequent
installation of the packages is not needed.

* adds preliminary FreeBSD test and release automation
* converts build script to be more unified/portable
* does not support caching; issues with symlinks when using built-in cache
* does not not include FreeBSD artifact upload
* adds annotations for failed FreeBSD tests

Prior to this change, users were always forced to specify the `--format`
option when invoking `poetry export`, although `requirements.txt` is
currently the only accepted value.

This patch modifies `poetry export` to make the `--format` option
nonobligatory.  If omitted, `requirements.txt` will be assumed as the
default value.

Co-Authored-By: Pradyun Gedam <pradyunsg@gmail.com>

Co-authored-by: Pradyun Gedam <pradyunsg@gmail.com>

This change ensures connection errors are handled explicitly for
cases where there are network issues.

In addition to the above, this includes type hint updates and minor
refactor.

Since poetry-core does not support python 3.4, local tests
fail when run with tox.

Resolves: #1407

Fix release workflow and scripts

This change introduces `--dry-run` option for the publish
command. When used, will perform all actions required for
publishing except for uploading build artifacts.

Resolves: #2181

* Upgrade cleo and clikit to the latest version

* Tweak colors

* Format logs from poetry-core