lots of new stuff
rearrangements, HBMTRL
learnability stub:
updating bfs3 chapter
file organization
reorg for boss
renamed chap dirs, so they have nice lex ordering
figures dir for expr
merged guarantees into models
pacmdp stuff
pacmdp stuff
pacmdp framework now refers to classes
wrote more conclusion
moved pacmdp into intro
removed tmp pacmdp proof
full draft! lots of improvements
working on little btis