This now uses year ranges, which I'll update annually.
This also renames "R-T Specialty" to "Ryan Specialty Group". The latter is
the parent company of the former. I was originally employed under the
former when LoVullo Associates was purchased, by I now work for the parent
company.
This would be better handled by better template arithmetic features, but
that's for another time.
* tplgen.xml (_for-each-n_): Add `current_n_dec' for caller body, which
decrements `current_n` by 1 (for 0-indexed values).