#2 fix the infinite loops in quote highlight

[Lluís Batlle i Rossell]

I've tried it, and I think it works.

It also partially solves the "comments in quotes"
problem - at least cbrowser doesn't give an error or
hang. :)

I'll have to spend more time improving juhika's patch.

Ah, the author cannot be contacted anymore through his
sf email address :(

[Lluís Batlle i Rossell]

patch for solving the highlight problem of \ in quotes