forest: DEBUG => INFO
greatly decrease logging to selectively search for bug cause
more logging to track down stack overflow
add unify for debugging stack overflows
-logging for stack overflow
-looking for bugs in remove-top-values
more logging to discover source of cycles
make cycle-detection only happen with log/debug
current logging settings
more logging
add :pred value to prepositions "a" and "per" to prevent cycles
in (unify) working on ref-containment detection to avoid cycle creation
return :fail if attempt to unify would create a cyclic graph.
whitespace, comments and logging
remove workaround for cycles: revert to existing "per" and "a" prepositions: do not specify :sen :pred for either of these.
in (overc), check for comp being nil; if so, return nil.
fix typo
increase some logging in overc from TRACE to DEBUG
redefine test lexicon and grammar while working on cycle detection