custom opCmp for array sort

[bearophile]

New:
> Thanks very much indeed for your help. The version posted does work. Unfortunately I won't be able to use D for my project, this bug has scared the management, D is still a moving target. I will have to wait until it is more stable.

Tell your management that you have used the D2 language that is in alpha stage still, instead of the D1 that is more stable.

Bye,
bearophile