has ticked past the appropriate time.
- optimize the frame encoding a bit
- use int64 consistently to avoid casting
Fix a bug - when retiring an offset, also update our memory map with the
new content, oops
If we run out of changes to index, keep emitting stores for content
at page=32,offset=0 forever
Switch to a weighted D-L implementation so we can weight e.g. different
substitutions differently (e.g. weighting diffs to/from black pixels
differently than color errors)