Bug 152828 Add the projectFolder property on module
When user doesn't set the resource folder path in designer, there should be a default working path for Birt to manage the report design and find the related resources. A new property should be added on Module: name: projectFolder type:URL This property only can be given from the open design method from session but should not be set after the module initialized. Concern about the backward compatiblity issue, a new method will be added. Open design with a config argument.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
* @return a string array containing message resource keys, return
	 *         <code>null</code> if there is no messages defined in the
	 *         design.
	 */
	public String[] getTranslationKeys( )
	{
		return getModule( ).getTranslationResourceKeys( );
	}
	/**
	 * Gets a list of translation defined on the report. The content of the list
	 * is the corresponding <code>TranslationHandle</code>.
	 * 
	 * @return a list containing TranslationHandles defined on the report or
	 *         <code>null</code> if the design has no any translations.
	 * 
	 * @see TranslationHandle
	 */
	public List getTranslations( )
	{
		List translations = getModule( ).getTranslations( );
		if ( translations == null )
			return null;
		List translationHandles = new ArrayList( );
		for ( int i = 0; i < translations.size( ); i++ )
		{
			translationHandles.add( ( (Translation) translations.get( i ) )
					.handle( getModule( ) ) );
		}
		return translationHandles;
	}