Should ASCs be updated in Hessian calculation?

[mattwigway]

ASCs used to get updated in Hessian calculation, because they were updated every time full_utility was called. However, they don't anymore with the new, faster Hessian code. I'm not sure which is better - on the one hand, ASCs wouldn't get updated in a classic discrete choice model where the ASCs were estimated parameters. One the other hand, the ASCs also aren't included in the Hessian like estimated parameters would be.