3187
3188 - bug in test harness

GC layer has been broken for a month, since 3152.
3189 - throw out all debug prints

I've been wrong-headed; debug prints need a separate abstraction.
Trace tests are for logging _facts_ about the domain. Debug prints
are for details of the current implementation.
3190

Function calls now correctly end bindings for destructured params.
3191

Another fix. Still some failing tests.
3189 - literate version now again passing all tests
3190 - literate now checks for 0 nrefs like 3140-2
3191

Purge references to 'intern' jargon.
3192 - better framework for debug prints
3193 - fold in layer for selective quoting
3194