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/ModuleHandle.java
* Saves the module to an existing file name. Call this only when the file
	 * name has been set.
	 * 
	 * @throws IOException
	 *             if the file cannot be saved on the storage
	 * 
	 * @see #saveAs(String)
	 */
	public void save( ) throws IOException
	{
		String fileName = getFileName( );
		if ( fileName == null )
			return;
		module.prepareToSave( );
		String resolvedFileName = URIUtil.getLocalPath( fileName );
		if ( resolvedFileName != null )
			fileName = resolvedFileName;
		module.getWriter( ).write( new File( fileName ) );
		module.onSave( );
	}
	/**
	 * Saves the design to the file name provided. The file name is saved in the
	 * design, and subsequent calls to <code>save( )</code> will save to this
	 * new name.
	 * 
	 * @param newName
	 *            the new file name
	 * @throws IOException
	 *             if the file cannot be saved
	 *