- Beefed up tests for new n-cube delta code (more to come)
- Wrote n-cube's .equals() method in terms of sha1() [code reduction]
- Improved sha1() computation to recursively compute sha1 (more durable than using JSON serialization)
- Tests for delta code nearly complete.
- Deep SHA1 computation converted from recursive function to stack with cycle check.
- Bug fix: deleteColumn() did not remove the old column ID from the scaffolding map, allowing it to still be found after deletion.