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
{
		locale = theLocale;
		if ( locale == null )
			locale = ULocale.getDefault( );
		activate( );
	}
	/**
	 * Activates this session within a thread. Used in the web environment to
	 * associate this session with a message thread. Required to allow the
	 * thread to access localized messages.
	 */
	public void activate( )
	{
		ThreadResources.setLocale( locale );
	}
	/**
	 * Dis-associates this session from a thread. Used in the web environment at
	 * the end of a message thread to clean up design-engine artifacts
	 * associated with the thread.
	 */
	public void suspend( )
	{
		ThreadResources.setLocale( null );
	}
	/**
	 * Opens a design given the file name of the design.
	 * 
	 * @param fileName
	 *            The name of the file to open. This name must include the file
	 *            name with the filename extension.