Document naming with the new loading scheme

Hi,

Since jowenn changed the loading of files, the document naming does not work 
for files with equal names.

Earlier, if I had two "Makefile.am"'s open, the second one would have it's 
name prepended "<2>" etc.

I did introduce that behaviour, and I liked it and now I miss it. So I suggest 
that we make it work like that again. Maybe using parens instead of angle 
brackets, so the file above would be "Makefile.am (2)"

Any objections?

-anders