By Liana B. Baker and Greg Roumeliotis (Reuters) - Citrix Systems, the U.S. cloud computing company targeted by activist hedge fund Elliott Management, is making a final attempt to sell itself as a whole before it embarks on asset sales, according to people familiar with the matter. Citrix, which had attracted the interest of private equity investors before it agreed in July to give Elliott a seat on its board of directors, is having new conversations with buyout firms, the people said this week. The company, which has a market capitalization of $11.6 billion, has also reached out to other...