fifozone-install tested, now works with FiFo 0.6.0

in this change:

1. fifozone-install now works with FiFo 0.6.0: which includes
   a. use default realm in snarl user creating and authoring
   b. setup leofs and also configure sniffle to use it
2. zone datasets is switched to base64-14.2.0
3. chunter bugs is fixed
4. added sys env check function