block less
exchange portability pt 1: assets
exchange portability pt2: markets
tweak estimate depths
(change-class asset 'standard-class)
flets frob
factor find-asset
clearer asset lookup
factor find-market
(change-class market 'standard-class)
clearer market lookup
deleting unreachable code
better support for recompilation
link directly from market to pair
tweak rebalance guard