[stringtemplate-interest] which ST errors are serious

[John D. Mitchell]

Hey Ter,

I need the ability to have a "strict" mode that throws errors/ 
exceptions.  Otherwise all of the messages being sent to the logs may  
or may not get looked at someday but someone with no clue. <think: big  
team>

This is one of the *huge* problems with e.g., xslt approaches. The POS  
just dumps out worthless, broken, etc. content that ends up discovered  
by e.g., users.

Having the configurable listeners is nice to deal with logging.

FWIW,
John