Provides a superclass for classes that function as models. The only behavior provided is fast dependents maintentance, which bypasses the generic DependentsFields mechanism. 1/23/96 sw

	keyboard
	arrowKey:from:

	menus
	perform:orSendTo: selectedClass step trash trash:

	text links
	addItem:

	dependents	top
	canDiscardEdits Answer true if none of the views on this model has unaccepted edits that matter.
	containingWindow Answer the window that holds the receiver. The dependents technique is odious and may not be airtight, if multiple windows have the same model.
	hasUnacceptedEdits Answer true if any of the views on this model has unaccepted edits.
	myDependents Private. Answer a list of all the receiver's dependents.
	myDependents: Private. Set (or remove) the receiver's dependents list.
	topView Find the first top view on me. Is there any danger of their being two with the same model? Any danger from ungarbage collected old views? Ask if schedulled?

	keyboard	top
	arrowKey:from: Process the up and down arrows in a list pane. Note that the listView tells us what index variable, how to get the list, and how to move the index. Derived from a Martin Pammer submission, 02/98

	menus	top
	perform:orSendTo: Selector was just chosen from a menu by a user. If can respond, then perform it on myself. If not, send it to otherTarget, presumably the editPane from which the menu was invoked.
	selectedClass All owners of TextViews are asked this during a doIt
	step Default for moephic models is no-op
	trash What should be displayed if a trash pane is restored to initial state
	trash: Whatever the user submits to the trash, it need not be saved.

	text links	top
	addItem: Make a linked message list and put this method in it