Octue

Summary
Explicitly define `Analysis` attributes so that code introspection tools can more easily detect their existence. This is useful for developers and general transparency/readability of the class interface.

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Contents

Refactoring
- Define `Analysis` attributes explicitly in constructor rather than implicitly using a `for` loop and `setattr`

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Testing
- Mock subprocess in subprocess logging tests

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**IMPORTANT:** There are 2 breaking changes.

Enhancements
- [x] **BREAKING CHANGE:** Add option to not show cloud directories as blobs in `GoogleCloudStorageClient.scandir`

Fixes
- [x] Ensure nested datasets' structures are preserved on download

Refactoring
- [x] Clarify `Dataset.download_all_files`
- [x] **BREAKING CHANGE:** Rename `Dataset.from_cloud` parameter

Testing
- [x] Make unittest ignore `ResourceWarnings` for clearer test output
- [x] Temporarily skip test failing on Windows

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Enhancements
- [x] Support nested datasets in `Dataset.from_cloud`
- [x] Give a more useful string representation to `Datafile`

Testing
- [x] Stop emulated cloud storage tests interfering with each other
- [x] Loosen remote logging test case for tox

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Operations
- [x] Fix `mkver.conf` so the semantic version suggested by `git-mkver` stays under `1.0.0`

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Thanks to idc101 [for this solution](https://github.com/idc101/git-mkver/issues/20)!

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Testing
- [x] Fix subprocess logging tests

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