title: How to open new project in a new tab in Atom?
body: <p>I'm on a Mac (MBP) and previously, I had set my Finder preferences to open any app in a new tab (open folders in tabs instead of a new window). It got Atom Editor to open new/diff projects in a tab vs a new window.</p>
  
  <p>My normal workflow might be something like this in iTerm: <code>atom .</code> then <code>atom ../proj</code></p>
  
  <p>This was working up until today. I've even restarted my Mac to see if it would persist or was some weird buggery.  No such luck. Any folder I open w/ Atom from iTerm now opens as a new window. How do I get it back to opening it w/ tabs again? </p>
  
  <p>I liked having other projects being opened and being tab-separated in Atom. (And I liked being able to pull them off into their own separate window.)</p>
  
  <p>TIA</p>