Bug 213126 Add support for DataEngine-leve dataset cache
In many cases the DataEngine-leve dataset cache is useful which ensure that a dataset is executed one time during rendering one report. To support this feature a new dataset property should be added. The Birt customer can choose whether this dataset need to be cached or not by setting the property in deisgn time.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
{
		super.visitStyledElement( obj );
		writeStyle( obj );
	}
	/**
	 * Writes the style and style properties for styled element.
	 * 
	 * @param obj
	 *            the styled element
	 */
	private void writeStyle( StyledElement obj )
	{
		property( obj, IStyledElementModel.STYLE_PROP );
		writeStyleProps( obj );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.elements.ElementVisitor#visitListing(org.eclipse.birt.report.model.elements.ListingElement)
	 */
	public void visitListing( ListingElement obj )
	{
		super.visitListing( obj );
		property( obj, IListingElementModel.REPEAT_HEADER_PROP );
		property( obj, IListingElementModel.PAGE_BREAK_INTERVAL_PROP );
		property( obj, IListingElementModel.SORT_BY_GROUPS_PROP );
		writeStructureList( obj, IListingElementModel.SORT_PROP );
		writeStructureList( obj, IListingElementModel.FILTER_PROP );
	}
	/*