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
public Library openLibrary( String fileName, ModuleOption options )
			throws DesignFileException
	{
		if ( fileName == null )
			throw new IllegalArgumentException(
					"The file name must not be null" ); 
		Library library = LibraryReader.getInstance( ).read( this, fileName,
				options );
		libraries.add( library );
		return library;
	}
	/**
	 * Opens a library given a stream to the library and the the file name of
	 * the library.
	 * 
	 * @param fileName
	 *            The name of the file to open. If null, the library will be
	 *            treated as a new library, and will be saved to a different
	 *            file. If not <code>null</code>, this name must include the
	 *            file name with the filename extension.
	 * @param is
	 *            stream to read the design
	 * @return the opened report design
	 * @throws DesignFileException
	 *             If the file is not found, or the file contains fatal errors.
	 */
	public Library openLibrary( String fileName, InputStream is )
			throws DesignFileException
	{
		ModuleOption options = null;