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/DesignSession.java
/**
 * Represents a design session for a user of the application based on the Design
 * Engine. Tracks the user's set of open designs, the user's locale, the
 * application units and so on. Also provides methods for opening and creating
 * designs.
 * <p>
 * <code>DesignSession</code> allows to specify customized resource locator to
 * search a file. This resource locator must be set before opening any
 * <code>ReportDesign</code>, so for example, when encountering a library tag
 * in the design file, the parser needs to know where to get the library file by
 * this resource locator, the code in the parser might be like the following.
 * 
 * @see org.eclipse.birt.report.model.api.SessionHandle
 */
public class DesignSession
{
	/**
	 * Resource path.
	 */
	private static String resourcePath = null;
	/**
	 * Sets resource path.
	 * 
	 * @param path
	 *            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 path )
	{
		resourcePath = path;