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
public Theme getTheme( )
	{
		if ( theme == null )
			return null;
		return (Theme) theme.getElement( );
	}
	/**
	 * Gets the name of the referenced theme on this element.
	 * 
	 * @return theme name. null if the theme is not defined on the element.
	 */
	public String getThemeName( )
	{
		if ( theme == null )
			return null;
		return theme.getName( );
	}
	/**
	 * Returns the resolved theme of the report design/library.
	 * 
	 * @param module
	 *            the module to resolve the theme
	 * @return the resolved theme of the report design/library
	 */
	public Theme getTheme( Module module )
	{
		if ( theme == null )
			return null;
		if ( theme.isResolved( ) )
			return (Theme) theme.getElement( );