updated migration file
Added addition of user_id to labels table
Added migration script to migrate user saved smart labels to the labels table
Added down migration to recreate the users_smartlabels table
Added migration script to migrate user smart labels back to users_smartlabels on down migration
Added smart_key to labels up migration
Added new logic to create system smart labels
Added md5 hashes for smart labels upon import
Fixing errors and adding default do label