* tree: make open method use mode and encoding
* api: try to open using self.tree if output not found
* repo: rename OutputMissingException
* test: api: test adding not cached output
* api: open: exists test instead of try
* repo: open: try opening from tree first
* repo: open: handle missing and not cached files
* repo: open: separate find out logic from opening
Replaced Path* dataclasses with PathInfo/URLInfo/CloudURLInfo, which
know how parse, serialize, stringify and join themselves. They also
provide useful accessors like part of an url or pathlib.Path like
.parent or .name.
Along the way two families of bugs where fixed and should never occur in
the future:
- paths not matched as strings anymore, e.g. using str.startswith()
- Output.path is eliminated as ambiguous
Both families might had caused undefined surprising behavior when local
and remote paths clash.
As a part of this:
- DataCloud._cloud was refactored into `.get_remote()`
- data stopped using internal _cloud
- added a parametrization for remote tests
Paweł Redzyński
Alexander Schepanovski