Bug 315315 Warning messages seen while starting up workbench
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/util/PluginSettings.java
* Registers an aggregate function implementation, the class should
	 * implement the IAggregateFunction interface. The displayName will be the
	 * same as the name.
	 * 
	 * @param sName
	 * @param sAggregateFunctionClass
	 *            the full qualified class name of the implementor.
	 * 
	 * @see IAggregateFunction
	 */
	public final void registerAggregateFunction( String sName,
			String sAggregateFunctionClass )
	{
		registerAggregateFunction( sName, sName, sAggregateFunctionClass );
	}
	/**
	 * Registers an aggregate function implementation, the class should
	 * implement the IAggregateFunction interface.
	 * 
	 * @param sName
	 * @param sDisplayName
	 * @param sAggregateFunctionClass
	 *            the full qualified class name of the implementor.
	 * 
	 * @see IAggregateFunction
	 */
	synchronized public final void registerAggregateFunction( String sName,
			String sDisplayName, String sAggregateFunctionClass )
	{
		String[][] newAggFuncs = new String[saBaseAggregateFunctions.length + 1][3];