Tab closing order

Hi there,

  Just  committed a patch that improves the workflow for those of
use that make regular use of tabbed browsing.

  Now,  upon  closing  the  active  tab,  the browser focuses the
previously  visited  one  (before  it  was just an adjacent one).
Dillo now remembers the full focus history of them.

  I hope you like it as much as I do. ;)

-- 
  Cheers
  Jorge.-