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Features:
* Simplify path specification so everything is relative to the originating manifest
* Rename ``MountedApp`` to ``RepoApp``, add ``repo`` and ``repo_compose`` arguments
* Add ``d0s`` command alias
* Add ``d0s use`` to set a default manifest
* Add ``d0s status`` and ``d0s log`` to assist host management
Bugfix:
* Fix inherited path resolution to be relative to the originating manifest's path
* Fix ``d0s exec``