Add Python exports to create AlgorithmProperty from Python.

Required to match behavour with old API.
Refs #7469
Fix algorithm returns in ported reducers. Refs #7469
Workaround for a places still wrapping std vectors. Refs #7469
Remove a couple of old invalid tests. Refs #7469
Port reduction/instruments directory to new api. Refs #7469
Port inelastic reducer to v2 API. REfs #7469