sec 5: many copy edits

also merge the sections "The Fusion Pipeline" into the individual sections discussing producer/producer and producer/consumer.
sec 5: update for new implementation of aletD
sec 5: copy edits to simplification
sec 5: nuke the loop recovery section ):
sec 5: begin discussion section
sec 5: discussion intro
sec 5: discussion/correctness
sec 5: copy edits
sec 5: discussion/ordering & repeated evaluations
sec 5: wibble
sec 5: discussion copy edits
sec 5: yet more wibbles
sec 5: related work
sec 5: combine the array fusion/implementing array fusion sections
sec 5: push CSE into the simplification section
title: this is a draft
sec 5: copy edits

Note to self, only do widows and orphans when compiling the entire document -- undefined references can lead you astray.