DLIST changes

[tridge at samba.org]

 > Perhaps the best would be to remove the third argument and it's users?
 > It is only used in 120 lines of code, and the compiler will show when
 > the job hasn't been finished. 

yep, this is what I'd prefer. I left the 3rd argument there when I did
the initial conversion in case we decided we didn't like the new
linked list approach and decided to revert. The new approach has
turned out really well, so it is time to remove that redundent
argument.

Cheers, Tridge