Licensing tightened down

The licensing had been a bit excessively lax, which was not fair to paying customers. It is still far from totalitarian, but it makes sure nobody is getting more than their fair share. I had to go through several sample scenarios to make sure the system works as it should, supporting numerous resellers, license types, differing versions (for some resellers where this matters), and varying update subscription terms.

If your activation code no longer works and you feel it should, please contact me.