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
*             if the old image is not found or the name of new one is
	 *             empty.
	 */
	public void replaceImage( EmbeddedImage oldVar, EmbeddedImage newVar )
			throws SemanticException
	{
		replaceObjectInList( IMAGES_PROP, oldVar, newVar );
	}
	/**
	 * Replaces an old object in the structure list with the given new one.
	 * 
	 * @param propName
	 *            the name of the property that holds a structure list
	 * @param oldVar
	 *            an existed object in the list
	 * @param newVar
	 *            a new object
	 * @throws SemanticException
	 *             if the old object is not found or the name of new one is
	 *             empty.
	 */
	private void replaceObjectInList( String propName, Object oldVar,
			Object newVar ) throws SemanticException
	{
		ElementPropertyDefn propDefn = module.getPropertyDefn( propName );
		PropertyCommand cmd = new PropertyCommand( module, getElement( ) );
		cmd.replaceItem( new CachedMemberRef( propDefn ), (Structure) oldVar,
				(Structure) newVar );
	}
	/**