Bug 124620 Referenced Parameter icon should be invalid if the parameter in library is deleted
Description: Referenced parameter icon should be invalid if the source parameter in library is deleted. Steps to reproduce: 1.Create a library. Insert a report scalar parameter. 2.Create a report, use the above library. In the library explorer, pull the parameter to the data explorer view of report. 3.Open the library file, delete the parameter. Then reopen the report design file, the icon of parameter seems nothing happened. But if those operations happened in dataset, the icon of dataset in the report will be invalid. It is acceptable. Expected Result: The icon of referenced parameter should be invalid.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
}
	/**
	 * Checks whether the root of the current element is included by
	 * report/library.
	 * 
	 * @return <code>true</code> if the root of the current element is
	 *         included by report/library. Otherwise <code>false</code>.
	 */
	private boolean isRootIncludedByModule( )
	{
		DesignElement tmpContainer = getRoot( );
		if ( tmpContainer instanceof Library
				&& ( (Library) tmpContainer ).getHost( ) != null )
		{
			return true;
		}
		return false;
	}
	/**
	 * Determines if the current element can contain an element with the
	 * definition of <code>elementType</code> on context containment.
	 * 
	 * @param module
	 *            the module
	 * @param slotId
	 *            the slot id
	 * @param defn
	 *            the definition of the element
	 * @return <code>true</code> if the slot can contain the an element,
	 *         otherwise <code>false</code>.