Thought that Dell buy out was a done deal? Well, the Blackstone Group and Carl Icahn clearly don't think so, with the Wall Street Journal reporting that both have contacted the committee of Dell's board just before the shutoff deadline this Friday. The would-be investors are reported to be working on their actual bid amounts, and in the process buying them up to four more days thinking time. Reuters reports that Blackstone's tentative offer is already in, according to sources, but at this time the company is yet to comment. Despite a recent slump in pro