title: open a file under cursor in a split window
body: <p>I often jump from a file to file,  while working  a large codebase. I typically do this by way of  putting cursor on the file, say foo.h, and typing "gf". I wonder if I can do the same thing, yet open the file in a split window.</p>
  
  <p>One obvious solution is to simply type: vsp (sp) filename.</p>