Xal

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- Nothing changed yet.

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Simplify first steps with `xal`.

- Feature 12 - First explain how to install xal with full features, then
mention ability to install with restricted set of dependencies (was
restricted install first).

- Feature 13 - Session initialization calls client.connect(). Session
constructor's signature changed, making usage of sessions more
straightforward.

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Still a proof of concept. Main features: pathlib interface, local and fabric
sessions.

- Feature 3 - Introduced support of SSH session using Fabric.

- Feature 5 - LocalSession and FabricSession have a pathlib implementation.

- Improved documentation.

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Initial release as a proof of concept. Main feature: sh interface.

- Feature 6 - Introduced proof of concept implementation of ``sh`` interface.
Using a basic implementation for local session, based on subprocess.

- Feature 7 - Proof of concept implementation of ``dir`` interface, with a
basic implementation for local session based on Python builtins (os, os.path,
...).

- Feature 8 - Introduced contextual execution architecture: session, registry,
providers, resources, client.