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/SessionHandle.java
{
	/**
	 * The implementation of the design session.
	 */
	protected DesignSession session;
	/**
	 * Sets resource path.
	 * 
	 * @param resourcePath
	 *            the resource path to set. It must be an absolute path based on
	 *            file system and must present a dictory.
	 */
	public static void setBirtResourcePath( String resourcePath )
	{
		DesignSession.setBirtResourcePath( resourcePath );
	}
	/**
	 * Gets resource path. {@link #setBirtResourcePath(String)}
	 * 
	 * @return the resource path set in the session
	 */
	public static String getBirtResourcePath( )
	{
		return DesignSession.getBirtResourcePath( );
	}
	/**