@param file the file containing the include directives
	 * @param depth depth to which includes are followed, should be one of
	 * {@link #DEPTH_ZERO} or {@link #DEPTH_INFINITE}
	 * @return an array of include relations
	 * @throws CoreException
@param file the file containing the include directives
	 * @param depth depth to which includes are followed, should be one of
	 * {@link #DEPTH_ZERO} or {@link #DEPTH_INFINITE}
	 * @return an array of include relations
	 * @throws CoreException | IIndex.java