Some UI changes for adding/updating ACL of user/group
This fixes a few things:
1. Use same style to the update ACL button as we do in Issue Tags section
2. Make column in add user / add group page a little larger
3. Give a little more space between username and access
4. Order of access to be 'ticket', 'commit', 'admin'
5. While updating a user or a group's acl, make his current
acl selected.
6. While updating a user or a group's acl, make the username
section readonly