[PHP-DOC] Grouped functions working in livedocs

[Gabor Hojtsy]

Cheers,
Today with good cooperation from the guys on phpdoc#, we made the 
grouped function listing (RFC/manual.xml.in) work in livedocs. With 
introducing a simple new grouping tag, this change needs our own DTD 
(which is based on DocBook), but I beleive it is worth this small change.

Check out the grouping on the unofficial livedocs site here:
  http://livedocs.phpdoc.info/index.php?l=en&q=manual
Now it would be nice to discuss two things:
  - whether these categories are fine
  - whether the reference sections are categorized in the right
    places or not
After we finalize the categorization, we can put the category names to 
entities, so they will work with translated manuals too.

Now this is another reason to use (and work on soon switching to) livedocs.
Goba