Several updates:

• The cleanup of the MI abuse of cpu_critical_*() is done.
• Note the VM change salc has been comitting.
• Note that jeffr finished making malloc() and free() not require Giant.
• I've just about finished all the td_ucred and p_ucred stuff now.
• Mark all the mutex changes I committed today as done.
• Add two new WIP entries for the work alc is still doing in the VM.