[server] install custom sql scripts before creating tables for the schema
A cube might need something like 'CREATE EXTENSION postgis' before
creating tables for its entities, to add new final types.
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')