2674 - ack, undo 2673

rippleIncompleteEval relies on binding conses to values.
(2673 was triggered by http://arclanguage.org/item?id=17509)
2675 - make nested log levels work right

Bugfix to 2662. This changes how I think about log levels; the baseline
log-nothing level is no longer 0 but some large number. Higher levels
always log less than lower ones.
2676 - cleanup an ancient test

This continues to cover 1360.