title: What should I do about xcuserdata directories with my old username?
body: <p>(I have a mac running Mountain Lion with Xcode 4.5.2)</p>
  
  <p>I changed my username a while ago, and Xcode has started recreating <code>xcuserdata</code> directories with the new username at <code>$path_to_.xcodeproj/xcuserdata/blackl.xcuserdatad</code>. I've been working with it like that since, and I can't remember if anything seemed to have reset after the change, so whatever was in there must not have been too important…</p>
  
  <p>What does Xcode store in <code>xcuserdata</code> and what should I do about the old ones? There are some old projects I haven't opened since the change; I could just rename the directories in those. Newer projects will have two directories (<code>blackl.xcuserdatad</code> and one with the old username); what should I do in those cases?</p>