Eliminate the Work.abstract property and move the Document.content property
to Work.content instead. Update affected views, and re-base some classes
that were deriving from Document just to get Document.content to now be
derived from Work instead.
The Document class now has a "pass" body with no additional properties. It
is debatable whether Work should become Document, since I am not sure that
we plan to be able to generically display, say, a Quiz or a Question (which
are Works) on the home page (which can only specifically display a Document,
or now, the basic Work entity...).
Patch by: Todd Larsen
Review by: to-be-reviewed
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