v0.6.0 - git_bare: Add support for skipped/missing/absent/hidden contents - git_bare: Optionally access the objstorage directly - git_bare: Use batched content_get() instead of content_find() - git_bare: Use directory_get_entries instead of directory_ls, it should be faster - git_bare: Refactor the graph descent using explicit stacks instead of the call stack. - git_bare: When possible, use swh-graph instead of swh-storage to query revision history - git_bare: Deduplicate object downloads and writes - Add a naive git bare cooker - cli: Add 'cook' command, to run cookers without Celery - tests: Run all directory tests on the gitfast cooker - tests: Add in_memory_backend.py - tests: Make test_directory_bogus_perms/test_revision_bogus_perms/ actually test the cookers