Supporting legacy <image>

[Harri Porten]

Hi!

Some reworking of our tag name representation (r867535) broke support for 
legacy HTML elements. The question is do which degree we want to fix or 
drop that. The misc/maketags made the following elements equivalent

    image -> img
    anchor -> a
    listing -> pre

for pre HTML 4 compat. I've put up a test on 
http://www.froglogic.com/~porten/compat.html that tests both HTML parsing 
and createElement() DOM calls for those three. Results:

   - neither Firefox, IE nor Opera special case "anchor" and "listing". I 
was not able to find any sign of <anchor> btw.

   - Opera and IE map "image" onto "img" both in the parse and 
createElement()
   - Firefox does special-case "image" on createElement() only.

My suggestion would be to follow IE and Opera. Firefox is inconsistent. A 
proposed patch is attached but I'm not fully sure it's correct and is 
applied at the correct level. Maksim or Vyacheslav may be able to suggest 
a simpler if (id == ID_IMAGE) id = ID_IMG; hack at 1-2 central places 
only.

Harri.
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