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
*            the algorithm to be set.
	 */
	public void setResourceLocator( IResourceLocator algorithm )
	{
		assert algorithm != null;
		resourceLocator = algorithm;
	}
	/**
	 * Returns the installed search file algorithm. If no algorithm was
	 * installed, returns the default one.
	 * 
	 * @return the installed search file algorithm.
	 */
	public IResourceLocator getResourceLocator( )
	{
		assert resourceLocator != null;
		return resourceLocator;
	}
	/**
	 * Returns the provider instance which provides the absolute dimension value
	 * of predefined font size choice.
	 * <ul>
	 * <li><code>FONT_SIZE_XX_SMALL</code>
	 * <li><code>FONT_SIZE_X_SMALL</code>
	 * <li><code>FONT_SIZE_SMALL</code>
	 * <li><code>FONT_SIZE_MEDIUM</code>
	 * <li><code>FONT_SIZE_LARGE</code>
	 * <li><code>FONT_SIZE_X_LARGE</code>
	 * <li><code>FONT_SIZE_XX_LARGE</code>
	 * </ul>