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Params: construct a unified Parameters/Defaults scheme

	- object parameters are stored in class or instance attribute 'parameters',
	which for each can store its own attributes or look up the hierarchy for
	values
	- parameters allow storage and retrieval of values separated by execution_id
	- ClassDefaults: see DEPRECATION: now refers to defaults on a class's
	parameters object
	- instance_defaults: see DEPRECATION: now refers to defaults on an
	instance's parameters object
	- validation and parsing of parameters are stubbed and can be done by adding
	a _validate_<param name> or _parse_<param_name> method to a Params class
	definition
	- add tests for parameters

	DEPRECATION:
	- ClassDefaults now becomes .class_defaults on instance and .defaults on
	classes
	- instance_defaults now becomes .defaults on instances

mg to Params if incl: change to return None if value not found - right?

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