title: smartgit and kdiff3 integration
body: <p>The merge tool that come with smartgit is very confusing.<br/>
  I am not able to configure kdiff3. I dont get to configure the common ancestor. <br/>
  These are the only three files they give me to configure: ${mergedFile} ${rightFile} ${leftFile}<br/>
  Is there a way to configure kdiff3 and use 3-way merge?</p>