User privileges

Since 0.6.0, there's a user privileges/permissions system. You can make the user "USERNAME" an admin by doing

./bin/gmg makeadmin USERNAME

An admin gets access to an Admin Panel, and when looking at other user pages, is able to revoke/give privileges. Default ones are:

active 	Yes 	
admin 	No 	
commenter 	Yes 	
moderator 	No 	
reporter 	Yes 	
uploader 	Yes 	

How do we change the default set of privileges?