Bug 200471 Add "need not sort for grouping" option in report item
Currently when Data engine proceeds groups, it always sorts the result set according to given group key.However that should not be necessary when the raw data is already sorted. So we'd like to add new options so that user can indicate whether should we sort the data before grouping. In model, we should allow user to set a "need not do sort for grouping" option to all the report element that can be grouped(table, list,etc.)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
protected void propertyCDATA( IStructure structure, String memberName )
	{
		writeProperty( structure, null, memberName, true, false );
	}
	/**
	 * Writes one property entry of an structure without member name.
	 * 
	 * @param structure
	 *            the structure
	 * @param memberName
	 *            the member name
	 */
	protected void propertyWithoutName( IStructure structure, String memberName )
	{
		writeProperty( structure, null, memberName, false, true );
	}
	/**
	 * Writes the resource key.
	 * 
	 * @param obj
	 *            the design element
	 * @param resourceKey
	 *            the resource key value
	 * @param resourceValue
	 *            the user-visible resource value
	 */
	protected void resourceKey( DesignElement obj, String resourceKey,
			String resourceValue )
	{
		resourceKey( obj, resourceKey, resourceValue, false );