Bug 130492 Provide a method to serialize the report with library information.
Currently, when engine generate the report document file, the document does not contain any library information. That will cause many propblem on server side. Model should provide a method to serialize the report with library information to a stream so that the generated report document can contain all information that the report need.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
* @return The cloned structure list.
	 */
	private static ArrayList cloneStructList( List list )
	{
		if ( list == null )
			return null;
		ArrayList returnList = new ArrayList( );
		for ( int i = 0; i < list.size( ); i++ )
		{
			Object item = list.get( i );
			if ( item instanceof IStructure )
			{
				returnList.add( ( (IStructure) item ).copy( ) );
			}
			else
			{
				assert false;
			}
		}
		return returnList;
	}
	/**
	 * Clones the value.
	 * <ul>
	 * <li>If the value is of simple type, like integer, or string, the
	 * original value will be returned.
	 * <li>If the value is strcuture list, the cloned structure list will be
	 * cloned.
	 * <li>If the value is structure, the cloned structure will be cloned.
	 * <li>If the value is element/strucuture reference value, the