Pull Request for Issue770: SGMAppController Upgrade Permissions

https://github.com/acquaman/acquaman/issues/770

Altered:
  - only the 'sgm' user would be able to do the upgrades
  - the other users would be able to do the upgrades only when they run the SGMAcquaman program with argument "--enableSGMDatabaseUpgrade"

@dretrex @davidChevrier