Bug 88838 [Undo] - API cleanup - remove IContextConsultingOperationApprover
Early on this was involved in scenarios where editors examined other operations. This is no longer used. Operation approvers generally apply to all contexts and are installed at the OperationHistory level. Until there is a concrete need for this API it should be removed. It is gratuitous at this point.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/IOperationHistory.java
*            the progress monitor to be used for the redo, or null if no
	 *            progress monitor is provided.
	 * @param info -
	 *            the IAdaptable (or <code>null</code>) provided by the
	 *            caller containing additional information. When this API is
	 *            called from the UI, callers can use this to provide additional
	 *            info for prompting the user. If an IAdaptable is provided,
	 *            callers are encourated to provide an adapter for the
	 *            org.eclipse.swt.widgets.Shell.class.
	 * @return the IStatus indicating whether the redo succeeded.
	 * 
	 * The severity code in the returned status describes whether the operation
	 * succeeded and whether it remains in the history. <code>OK</code>
	 * severity indicates that the redo operation was successful and that the
	 * operation has been placed on the undo history. Listeners will receive the
	 * <code>REDONE</code> notification.
	 * 
	 * <code>CANCEL</code> severity indicates that the user cancelled the
	 * operation and that the operation remains in the redo history.
	 * <code>ERROR</code> severity indicates that the operation could not
	 * successfully be redone and that it has been removed from the history.
	 * Listeners will also be notified that the operation was removed. Any other
	 * severity code is not specifically interpreted by the history, and is
	 * simply passed back to the caller. For all severities other than
	 * <code>OK</code>, listeners will receive the
	 * <code>OPERATION_NOT_OK</code> notification instead of the
	 * <code>REDONE</code> notification.
	 * 
	 * @throws ExecutionException
	 *             if an exception occurred during redo.