Revert "Re-do changes to fix model."
But keep the this._ID notation.
This reverts commit 4374bf3ebaced4a84031fab910b45383553e6d5e.

In test harness js/json/object.html, replaced document.write()
        used /* */ for long comments, changed node name to
        not conflict with built in.
Modified addNode to optionally take properties, and removed addNodeObject()

Shortened up the naming convention for node
getters and setters:
        getNodeInputs -> getInputs
        getNodeUnits -> getUnits
        et cetera