Yahoo! Inc. has reached a compromise with billionaire investor Carl Icahn that will avoid the full scale battle over control of the company that was expected at the 1 August shareholders meeting.  The agreement means the Yahoo! board will expand to eleven members, to accommodate Icahn himself and two from the alternative slate of nominees he had initially set up to challenge the existing board. One member of the current nine member board, Robert Kotick, has decided to stand down.   Icahn had threatened to unseat the board after Yahoo!