Core data schema adjustments and functional history interface.
Change-Id: I69e9032dd0ffe99b32e039371472b3583695113f
Updated history interface to better sync with design specs.

Change-Id: Ie4fbda4824b28958b903febb4209b3d3b133a9b4
Added section tocLevel to core data schema.

Change-Id: I8e7df67e863208357f563196e62bb28aae37e239