Fixes:
SPECTRONUS-227 - Refit, keep rows one-for-one when refitting
SPECTRONUS-310 - Refit from v10.0 to 10.1 fails
This build adds the new RefitState column to the sysvariables table and a new system variable type. The main changes to refit are
RefitState for a row is null or 0 by default, 1 = the row has been refitted, -1 = the row is not suitable for refit
Instead of deleting the rows unsuitable for fitting they are now marked as -1
On startup the database schema is updated to back-fill any missing rows in the diagnosticvals and systemalerts tables
