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
public SlotHandle getStyles( )
	{
		return getSlot( IReportDesignModel.STYLE_SLOT );
	}
	/**
	 * Gets a handle to deal with a translation. A translation is identified by
	 * its resourceKey and locale.
	 * 
	 * @param resourceKey
	 *            the resource key
	 * @param locale
	 *            the locale information
	 * 
	 * @return corresponding <code>TranslationHandle</code>. Or return
	 *         <code>null</code> if the translation is not found in the
	 *         design.
	 * 
	 * @see TranslationHandle
	 */
	public TranslationHandle getTranslation( String resourceKey, String locale )
	{
		Translation translation = module.findTranslation( resourceKey, locale );
		if ( translation != null )
			return translation.handle( getModule( ) );
		return null;
	}
	/**
	 * Returns a string array containing all the resource keys of user-defined
	 * translations for the report.
	 *