v1.0.0 Main change: thismakes package loaders write releases instead of revisions Other more-or-less related changes: * Add missing documentation for `get_metadata_authority`. * opam: Write package definitions to the extrinsic metadata storage * deposit: Remove 'parent' deposit * cleanup tests and unused code * Document how each package loader populates fields. * Refactor package loaders to make the version part of BasePackageInfo