aiidateam / aiida_core / 5433

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develop: 74%

Pull #2569

travis-ci

Add tab-navigation methods to (some) nodes

This fixes #2230. In particular, now:

- CalculationNode have a `.inputs.<LABEL>` property that returns
  a manager to navigate incoming INPUT_CALC nodes
- CalculationNode have a `.outputs.<LABEL>` property that returns
  a manager to navigate outgoing CREATE nodes
- WorkflowNode have a `.inputs.<LABEL>` property that returns
  a manager to navigate incoming INPUT_WORK nodes
- WorkflowNode have a `.outputs.<LABEL>` property that returns
  a manager to navigate outgoing RETURN nodes
- Node *does not have anymore* `.inp` and `.out` as these were
  referring to incoming and outgoing and were ambiguous

Moreover, `Data.created_by` and `ProcessNode.called_by` methods were
already implemented and have been renamed to `Data.creator` and
`ProcessNode.caller`.

Also tests added for all these methods, including the already existing
ones.

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