aiidateam / aiida_core / 4431

68%

develop: 74%

Pull #2193

travis-ci

Finalize making `Code` a sub class of `Data`

By making `Code` a proper sub class of `Data` instead of `Node`, its type string
is also changed from `code.Code.` to `data.code.Code.` so we add a migration to
update these for existing databases.

In addition, the `aiida:code` plugin group no longer makes sense and so the entry
point for the `Code` class is moved to `aiida.data:code`. The entity loaders and
`QueryBuilder` will now do the right thing after updating the entry point loader
logic to treat `Code` as a sub class of `Data`.

Finally, the `Code` class no longer needed any backend specific code, so the
`AbstractCode` class is made concrete, moved to `aiida.orm.data.code` and the
backend specific implementations are removed.

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