[prog] quick sort using loops

[ed orphan]

Thanks all for the help. I've got a couple of
good examples of non-recursive Quicksort code and I've
gone through them with the debug just to see
how they work. 
Thank you Laurel Fan for this address:
http://www.library.cornell.edu/nr/cbookcpdf.html
Great scientific stuff.
  I also found an example from the old
Fidonet C group C Snippets from 1991 given
to the public domain by Raymond Gardner.
A few small changes and it compiles fine in Linux.
   It's good to know more than one way to
solve a problem.  Thanks.