The base tables are built using BuildBaseTables.sql. These provide common foundations for:
*PortCo Geography
*Other PortCo tables, including industry, id, cpi adjustments, geoids, patents & SBIR/STTR grants (note that these need updating)
*Firm variables (note that the full build is only done for firms that make growth investments)
*Round Line Joiner (RLJoiner) tables