New design of tag nesting cleanup within the parser.

Hi there,

  This is an important patchset that's just been committed.
There're plenty of details in the hg comments (hg log -v).

  This are changes that affect the way dillo copes with Tag Soup
(i.e. bad formed HTML). The idea is to create a valid doc tree
before passing it to Dw for rendering, so yes, rendering may change.

 Please check the comments, then browse your regular sites and give it
a test drive, then send some feedback.

 At least in my case there were nice surprises!

-- 
  Cheers
  Jorge.-