less confusing set of characters (mode symbols)?
switch levels 8 and 9
remove history
program labels, not yet meaningful
add clues
show current interpretation of programs

Needs to do a better job for the current program
box around current mode, current instruction
assign letters in the order programs are defined
remove the mouseover instrction
Merge remote-tracking branch 'origin' into gh-pages, update JS
mouse support
Merge branch 'master' into gh-pages, update JS