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
{
		if ( elementHandle == null )
			return;
		module.rename( elementHandle.getElement( ) );
	}
	/**
	 * Replaces the old config variable with the new one.
	 * 
	 * @param oldVar
	 *            the old config variable
	 * @param newVar
	 *            the new config variable
	 * @throws SemanticException
	 *             if the old config variable is not found or the name of new
	 *             one is empty.
	 * 
	 */
	public void replaceConfigVariable( ConfigVariable oldVar,
			ConfigVariable newVar ) throws SemanticException
	{
		replaceObjectInList( CONFIG_VARS_PROP, oldVar, newVar );
	}
	/**
	 * Replaces the old embedded image with the new one.
	 * 
	 * @param oldVar
	 *            the old embedded image
	 * @param newVar
	 *            the new embedded image
	 * @throws SemanticException