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
throws DesignFileException
	{
		return session.openLibrary( fileName ).handle( );
	}
	/**
	 * Opens a library with the given the file name.
	 * 
	 * @param fileName
	 *            name of the file to open. This name must include the file name
	 *            with the filename extension.
	 * @param options
	 *            the options set for this module
	 * @return handle to the library
	 * 
	 * @throws DesignFileException
	 *             if the file is not found, or the file contains fatal errors.
	 */
	public LibraryHandle openLibrary( String fileName, ModuleOption options )
			throws DesignFileException
	{
		return session.openLibrary( fileName, options ).handle( );
	}
	/**
	 * Opens a library given a stream to the design and the the file name of the
	 * design.
	 * 
	 * @param fileName
	 *            name of the file to open. If <code>null</code>, the library
	 *            will be treated as a new library, and will be saved to a
	 *            different file. If not <code>null</code>, it may contain