Transition from previous access methods

Semantics have changed: saves code, but may alter some uses.
- Always searches the stack
- OMS are facades with no internal state

	prior to ModelAccess	using ModelAccess
User Accounts Model	ctx.getAttribute("userAccountsOntModel")	ModelAccess.on(ctx).getUserAccountsModel()
	ctx.setAttribute("userAccountsOntModel", model)	ModelAccess.on(ctx).setUserAccountsModel(model)
DisplayModel	req.getAttribute("displayOntModel")	ModelAccess.on(req).getDisplayModel()
	session.getAttribute("displayOntModel")	ModelAccess.on(session).getDisplayModel()
	ctx.getAttribute("displayOntModel") ModelContext.getDisplayModel(ctx)	ModelAccess.on(ctx).getDisplayModel()
	ctx.setAttribute("displayOntModel", model) ModelContext.setDisplayModel(model, ctx)	ModelAccess.on(ctx).getDisplayModel()
	req.setAttribute("displayOntModel", model)	ModelAccess.on(req).setDisplayModel(model)
"jenaOntModel"	ctx.getAttribute("jenaOntModel")	ModelAccess.on(ctx).getJenaOntModel()
	session.getAttribute("jenaOntModel")	ModelAccess.on(session).getJenaOntModel()
	req.getAttribute("jenaOntModel")	ModelAccess.on(req).getJenaOntModel()
	ctx.setAttribute("jenaOntModel", model)	ModelAccess.on(ctx).setOntModel(ModelID.UNION_FULL, model)
	req.setAttribute("jenaOntModel", model)	ModelAccess.on(req).setOntModel(ModelID.UNION_FULL, model)

...

"jenaOntModel" is a previous term for the Union Full model. The convenience method methods getJenaOntModel() supports and setJenaOntModel(m)support this vestigial use.

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