Drive-by-change: Fix compiler warning.

This should getting rid of queries using USER-DEFINED.

Also enlarge select lists a bit otherwise the queries in the
restricted scope look too degenerated.

This should getting rid of queries using USER-DEFINED.

It's useful in impedance module as well.

The error rate is rather high for a long time so there are frequent
implicit rollback anyway.

Also move inline code for prod to proper .cc file.

This module provides feedback to the grammar on the failure rate of
productions to allow blacklisting them.

The idea was to test with a more conservative setting, but this causes
compatibility problems (OSX).

Only the aggregate variant for now.