added some more VM documentation
fixed slub_alloc issue
fixed annoying problem in slub AND in tcb_init
more VM docs
Merge commit '1610665d9cb58aec49f9522d624ba33daf093d07'
thr_create works
working on more generalized thr_create api
this is what I thought should happen
but this is the thing that actually works
better, more generalized thr_create interface, beginnings of a fork-like syscall