Bug 212505 Use default script ID to skip script debugging
In Dte side, when compile or evaluate java script, it would pass in a script source id. This kind of id is currenlty used by report script debugger. So to skip redundant processing for such kind of internal script evaluating, dte need pass in a default ID, which is defined as ScriptExpression.defaultID. If this id is already used for particular meaning and it can not pass in the default ID, we need define them as public constants and let script debugger check and skip them as well.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
/**
	 * Since the data set in master page will be executed in each page
	 * and while the data set in report body will only be executed once,
	 * we need to remember the current report item is in master page or not.
	 * This will be used to help store the executed resultSetID and load it
	 * to distinguish them.
	 */
	public void setExecutingMasterPage( boolean isExecutingMasterPage )
	{
		this.isExecutingMasterPage = isExecutingMasterPage;
	}
	
	public boolean isExecutingMasterPage( )
	{
		return isExecutingMasterPage;
	}
	
	/**
	 * Add a page break listener.
	 * 
	 * @param listener
	 *            the page break listener.
	 */
	public void addPageBreakListener( IPageBreakListener listener )
	{
		if ( pageBreakListeners == null )
		{
			pageBreakListeners = new ArrayList( );
		}