Bug 152830 Need model's support to add jar files
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
* Returns a slot handle to work with the master pages within the report.
	 * Note that the order of the master pages within the slot is unimportant.
	 * 
	 * @return A handle for working with the master pages.
	 */
	public SlotHandle getMasterPages( )
	{
		return getSlot( PAGE_SLOT );
	}
	/**
	 * Finds user-defined messages for the current thread's locale.
	 * 
	 * @param resourceKey
	 *            Resource key of the user-defined message.
	 * @return the corresponding locale-dependent messages. Return
	 *         <code>null</code> if resoueceKey is blank.
	 * @see #getMessage(String, Locale)
	 */
	public String getMessage( String resourceKey )
	{
		return getModule( ).getMessage( resourceKey );
	}
	/**
	 * Finds user-defined messages for the given locale.
	 * <p>
	 * First we look up in the report itself, then look into the referenced
	 * message file. Each search uses a reduced form of Java locale-driven
	 * search algorithm: Language&Country, language, default.
	 * 
	 * @param resourceKey