suggest to add 'heapsort'.

[Brian Gough]

Sorry, my original email was ambiguous there -- I should have said
that having our own sort would be useful as an alternative to relying
on the system library. Thanks for clarifying the point.

Ben Pfaff writes:
 > Brian Gough <bjg@network-theory.co.uk> writes:
 > 
 > > Thanks. A heapsort would be useful as an alternative to
 > > qsort(). [...]
 > 
 > I hope you're not assuming that qsort() is quick sort.  There is
 > no requirement that qsort() be implemented as quick sort, and it
 > often is not.
 >