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/core/Module.java
/**
	 * Sets the system id of the module. It is the relative URI path of the
	 * module.
	 * 
	 * @param systemId
	 *            the system id of the module
	 * 
	 */
	public void setSystemId( URL systemId )
	{
		this.systemId = systemId;
	}
	/**
	 * Finds a theme in this module and its included modules.
	 * 
	 * @param name
	 *            Name of the style to find.
	 * @return The style, or null if the style is not found.
	 */
	public Theme findTheme( String name )
	{
		ElementRefValue refValue = moduleNameSpaces[THEME_NAME_SPACE].resolve(
				name, null );
		return (Theme) refValue.getElement( );
	}
	/**
	 * Returns the theme of the report design/library.
	 * 
	 * @return the theme of the report design/library
	 */