Updated createTables.sql

Previously, create queries were not up to date with the current ER
Diagram.  This inconsistency needed to be reconciled across all materials,
including the create queries.  This commit updates create queries to
reflect most recent changes in the Database Schema and the ER diagram.

Updated 'style' to read 'mode'.
Removed unnecessary primary auto incrementing key in relationship tables.
Updated primary key in relationship tables to include both foreign keys.
Added and removed other attributes as needed in Artwork, Artist, and
Specific Location tables.