[Dillo-dev] Support for title attribute in tooltips

Rob wrote:

You are all likely to cringe in horror when you see what I have been up to today. I basically wanted to add hover/tooltip functionality for elements which contain the title attribute.

I remember discussing this with Johannes, and I think he had some reason that he was reluctant to check for the title attr there...? I hope he remembers because I can't seem to find record of it. BTW, strictly speaking, we shouldn't be calling Html_parse_common_attrs() for every element because I believe there were a few that don't have %coreattrs under ATTLIST in the spec.