[SQL] Move flag.data column to own table

[driusan]

This moves the data from flag.Data to a new table. The large size of the data was causing scans of the flag table to take a significant amount of time on large datasets due to fragmentation, even if the column was not used. The large amount of was was slowing down any query that joined the table (even if indexes were used.)

Moving the data to a new table means that queries that do a table scan are faster since joining the new instrument_data table only needs to pull in data that it needs.

(On a database with 6 million rows in flag, this change brought the timing of the query used for bulkLoadInstanceData down from ~5s to ~1.5s when bulk loading all the data for a single instrument.)

[driusan]

Sent as draft because this is a significant change for after the 26 release, but it should be good to go now.