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
* 
	 * @param description
	 *            the new description for the module
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setDescription( String description ) throws SemanticException
	{
		setStringProperty( Module.DESCRIPTION_PROP, description );
	}
	/**
	 * Returns the resource key of the static description of the module.
	 * 
	 * @return the resource key of the static description
	 */
	public String getDescriptionKey( )
	{
		return getStringProperty( Module.DESCRIPTION_ID_PROP );
	}
	/**
	 * Sets the resource key of the static description of the module.
	 * 
	 * @param resourceKey
	 *            the resource key of the static description
	 * 
	 * @throws SemanticException
	 *             if the resource key property is locked.
	 */
	public void setDescriptionKey( String resourceKey )
			throws SemanticException