Supply classes to local tasks (tabs).

Classes added to the primary/secondary links. Previous version had very odd menu classes. This patch isn't a big improvement since these arcane menu id's (mlid?) are the only way to reliably stick in classes. Would be better off if they are ID's but theme_links doesn't allow that on list items. Would be nice if we could modify it so it accepts ID's as an option and removes the redundant classes.

As it stands now, the primary links produce classes from "0" to X number of links. This is definitely a bug.

Primary/secondary local tasks, or "tabs" have classes to them. In Drupal 5 it was possible to override and get these classes in there but in Drupal 6, there's no information passed to the theme function to do anything short of brute force regex which is understood by few. --me included

Menu tree now has a depth class. This is difficult to select with css alone thanks to IE so these classes will make it a lot easier.

This may not be the best approach. Hopefully it'll get in with a few tweaks.