Node status

[liamhuber]

Adds new running and failed flags to Node.

running is turned on then off inside the run method; failed gets set when the node function raises an error. Nodes that are running or failed are not ready. Nodes that are running cannot be run, nor will their input data channels update.

For now, none of this is useful, but node status will be necessary once we introduce executors and the workflow is able to do other things while a node runs (either in the background or remotely).

[coveralls]

Pull Request Test Coverage Report for Build 4919472903

• 19 of 20 (95.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 13.676%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyiron_contrib/workflow/node.py	13	14	92.86%

Totals
Change from base Build 4915188369:	0.1%
Covered Lines:	1692
Relevant Lines:	12372

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💛 - Coveralls