Unused system table columns

The following system table columns are currently unused and don't appear
to be in the line of resurrection.

pg_language.lancompiler
pg_operator.oprprec
pg_operator.oprisleft
pg_proc.probyte_pct
pg_proc.properbyte_cpu
pg_proc.propercall_cpu
pg_proc.prooutin_ratio
pg_shadow.usetrace
pg_type.typprtlen
pg_type.typreceive
pg_type.typsend

This adds up to quite some space -- on disk and on the screen.  I think we
should remove them.

-- 
Peter Eisentraut   peter_e@gmx.net