- Add ability to rewrite attributes on their parsing.
This required making sure that if we have an AttrImpl it still gets passed down 
to parseAttribute, hence the changes in the overloads for that
- Use that ability to fix border=00 on tables, as suggested by Germain.
It seems to not always restyle properly when border attributed changed dynamically, though,
hence keeping this open.
CCBUG:167567

svn path=/trunk/KDE/kdelibs/; revision=843794