Rearrange vm.c so it's in logical order and prints nicely.  Shorten a few functions in uninteresting ways to make them fit.

Rearrange proc.h and proc.c to get our action-packed spreads back (mostly).  They also make sense in this order, so it's not just for page layout.

Re-re-arrange bootasm and bootother.  We can't get bootasm and bootmain on the same page, but this will make them easier to flip between.

I totally misunderstood the even/odd spec.  Add some docs, remove my 'left+' hack, and orthogonalize left/right versus even/odd so you can specify them independently.

Our proc.c alignment is perfect.  Since ksegment/usegment went away, we get a column back, so we get our two action-packed spreads.

pdf has very good page breaks now.
would be a good copy for fall 2009.

PDF at http://am.lcs.mit.edu/~rsc/xv6.pdf

Various changes made while offline.

 + bwrite sector argument is redundant; use b->sector.
 + reformatting of files for nicer PDF page breaks
 + distinguish between locked, unlocked inodes in type signatures
 + change FD_FILE to FD_INODE
 + move userinit (nee proc0init) to proc.c
 + move ROOTDEV to param.h
 + always parenthesize sizeof argument