use :rule rather than :comment for rule-lex caching.
allow fo-ps to handle vectors
add lightning-bolt here
-add more logging
-make lexical-headed-phrases a lazy-seq rather than a function
- local non-cache-using (lightning-bolt) useful for testing small lexicons and grammars
-generate test works now
logging and comments
exclude (generate)'s lightning-bolt (though might make use of it at some point here in workbook)