Added stored procedures for dropping and creating indexes if they do/don't exist, respectively. Added stored functions to inquire whether indexes exist. New script defineMySQLProcedures.sql defines those into the database. Modified executeCSVLoad.sh so that it deals not only with updates, but also with an initially empty db without raising errors. Modified createIndexForTable.sh to create the indexes for just one, or all tables, and to tolerate indexes already being in place. Continued to make manageDb.py more and more robust.